Wem MP1 MIDI Partner Detailed instructions & Specs.

(Remember, you don't need to look at this at all, unless you want to;- you can literally just plug in and play ! )

Welcome to the WEM MIDI Partner, the worlds first ‘what you see is what you get’
MIDI Accordion Sound  E x p a n d e r . -  MP1 MkII

Note that these instructions apply to the Midi Partner Mk1 as well if you ignore the extra line of buttons.


Forty-six preset sounds and left-hand manual percussion instantly available, no complex multi-layered menus :
just press and play.

The control bpanel is divided into 4 sections as indicated by the similarly coloured rows of buttons, corresponding to 4 possible sections of a MIDI accordion – Bass, Chords and 2 Right-hand selections which may be used together as ‘layered’ sounds i.e. 2 sounds on at the same time, one from each section.

The expander is designed to work with the standard accordion MIDI set-up with Bass on channel 3, Chords on channel 2 and Right-hand on channel 1 with an optional ‘solo’ or second right hand on channel 4 if it is sent – otherwise they work together from channel 1.

To get going :

Plug your MIDI OUT lead from your MIDI accordion into the MIDI IN socket on your MIDI Partner.

Plug in an amplifier (or headphones) into the audio out socket.

Plug in the external power unit into the power-in socket – you can actually do this in any order – Press the power on switch and all the lights on the unit should come on. Now turn the volume up a little on your amplifier and turn the MIDI Partner volume controls up, let’s say all controls half way to start with, and when you play your accordion, you should hear sounds immediately. 

Press the instrument select buttons on each section as you play to change to different instrument sounds, adjust the reverb and volume levels to suit. At switch on, the default instruments are Bass-1, Chords-1, Rh1-1 and 

Rh2-1, i.e. the first which is the upper left of each bank of buttons. On the right-hand sections, the instrument select buttons, if pressed a second time will turn the instrument off, this can be seen by the Mute light going off. Pressing the button again will select the instrument again; the Mute light coming back on to show the sound is unmuted. The Mute button may also be used to turn the sound on or off again.

The power light is on constantly during normal operation but will momentarily flash off when a button or footswitch is pressed to indicate the event. The power light will flash another colour upon receipt of a recognised MIDI message which will show you if you are receiving MIDI from your accordion. 

A MIDI THRU socket is provided for connection to other MIDI equipment, should it be required.

The Controls:

Each sound button on the control panel gives you instant access to one instrument sound and you have a choice of 10 for the bass plus a bass register button, 12 for the chords and 12 for each of the two right-hand sections which you can have on individually or together as layers. Each section has its own individual volume controls so you can balance your sound easily and individual reverberation controls for suitable instrument ambience. There is an octave register button on each right-hand section and they also have their own mute buttons, which allow you to turn off the sound instantly. They have indicator lights so you can see which section is on.

In addition there are 4 optional footswitches which can be assigned to operate any of the buttons on the front panel allowing hands free operation of changes. The footswitch assignment is remembered permanently (even with power off) until changed again. This allows you to make seamless instrument or sound changes with your feet during performances.

The mute buttons on the right-hand sections turn their respective sections sounds, on or off. If the light is on then the sound is on. If the light is off the sound is off. Each press of the button will change the state of the mute as shown by the indicator light. Any Right-hand sound button, if pressed again will also mute (turn off) that sound, the main mute light will go on or off to show whether the sound is on or off. The main mute button or a sound button can be used to change the state of the right-hand mute and bring back the same sound or another..

There is also an alternating-mute option, where, when Rh1 is on, Rh2 is off and vice versa.. If both mute buttons are pressed together, then the alternating mute is activated. Rh1 light will be on initially.  The Rh2 mute button will now swap the right-hand sections i.e. as Rh1 goes off and Rh2 will go on, press again and Rh2 goes off and Rh1 goes on. To cancel this mode, press the Rh1 mute button. Rh2 could be assigned to a foot-switch so foot controlled operation is possible.

If you require Bass and/or chords to be off, then one or more of the sounds may be programmed with a ‘blank’. This is also possible with the right-hand sounds if for any reason you do not wish to use the mute buttons and are willing to give up a sound. See the section on the ‘Sound editing’ mode. The right hand instrument buttons if pressed again will also switch off the instrument – the mute light will indicate the state of the right hand sounds.

The octave register buttons may be pressed to change the selected instrument sound down one octave, pressing again returns to the original register and so on, pressing the sound select button again has the same affect as returning the sound to its default octave register. New sounds selected will always start in their default registers. With some sounds that consist of 2 layers, only one part is dropped an octave for variation. 

The bass note range may be changed by pressing the bass register button (which is at the position of bass button 6 and is a different colour to the bass sound buttons) to put it into a more suitable register with your accordion or the bass instrument range.  After switch-on, the standard bass range is in operation, this may be lowered by about 2/3 of an octave by pressing this button to give a nice low bass end.

The chords and bass have a sound-bank change button i.e. another bank of 5 sounds is available on the 5 bass or 6 on the 6 chord sound selection buttons. The lights, when on, show that the default Bank A is present and when the light is off then Bank B is present.

Master tune control. If you need to change the pitch of the Midi Partner, press and hold the Rh2 Mute button until the Rh2 Mute light starts flashing and then release the button. The Rh2 reverb control will now act as overall pitch control over about a quarter tone. Press the Mute button again to store the tuning setting and return to normal.

The bass sounds (and drums) may be played by the right hand by engaging the Orchestral Bass mode. Turn the power off. Hold buttons Rh1 and Rh6 and while holding, turn on the power again. The right hand sound select buttons will not function. The right hand lights will be off.  Sound selection is done using the bass section. The Chord section will also function as normal along with the drums. To cancel this mode follow the same power up procedure or load factory presets.

This mode may be useful for accordion orchestras if you are assigned to play bass/chord parts and prefer to do it with the right-hand keyboard.

Solo/Forte button. When pressed, this button will change the volume level of the right-hand sounds. You may preset the button from no volume at all to a much louder than normal setting. By setting the volume to off, you effectively mute both right-hand 1& 2 sound together.

To set the level, press and hold the solo/forte button until the bass bank light starts flashing, you can release the button now and use the bass reverb control to set the new sound level. Press the solo button again to store the setting and return to normal. If you change sounds, the solo level stays on. 

Hawaiian button. This produces a pitch-bend-down effect which jumps down and then slides up to the original pitch on the right-hand sounds. To use it, it is probably best to assign a footswitch to the button so it can be foot operated, this makes setting it easier as well.

To change the setting, press and hold the Hawaiian button in until the bass and chords bank lights start flashing. The bass reverb control will change the slide up time and the chord reverb control will change the how far down the pitch will drop when the button or footswitch is pressed, the maximum down amount is 1 tone. You can test the effect by pressing the button or the assigned footswitch. To store the settings and exit to normal, press and hold the button again until the bass and chord bank lights stop flashing.

Tremolo button. This starts a tremolo effect on the right-hand sounds. Tremolo is a gently changing volume effect, the speed and depth of which may be set. To change the effect, press and hold the tremolo button in until the right-hand mute lights start to flash. Right-hand 1 reverb control will now change the depth of the effect and right-hand 2 reverb control will change the speed of the effect. To store the new settings and exit to normal, press the tremolo button again. If you change sounds, the tremolo effect is cancelled so it will not appear on the newly selected sound.

Drum buttons (1,2 & 3)control the drum sounds used on the Left-hand manual percussion which is a feature that will play a bass drum and open hi-hat (or other percussion instruments dependent on the drum set selected) with each press of the accordion’s bass buttons and a snare drum and closed hi-hat (or similar) on each press of the accordion’s chord buttons. This feature, despite its simplicity is remarkably useful if you can learn to play with it, as you basically have drums which follow you exactly and speed up and slow down with your playing.

The Drum on/off buttons on the front panel will alternately switch the drum sounds on oroff.

Also any of the footswitches may be assigned as percussion on/off, the same as the other buttons – the front panel button is still always available.

If the one of the Drum buttons is held in for more than 1.5 seconds, the bass and chord bank lights will start to flash quickly, the button may be released while the lights continue to flash and it is now possible to change the bass percussion volume with the bass reverb control and the chords percussion instrument volume with the chord reverb control while the bass or chord sounds remain as they were. This level setting will be remembered permanently until changed again. As soon as the percussion button is pressed again, it will go back to its normal function of percussion on/off. The MIDI Partner MKII is fitted with 3 Drum buttons and each one will work as described above and each of the 3 drum kits volume levels may be set and are remembered independently.

In all the editing (adjustment and setting) modes above, the power light will ‘blink’ with each incremental turn of the Reverb controls – which at this time are used as the editing controls.

Using footswitches.

A footswitch may be plugged into any of the four footswitch jacks and assigned to any of the front panel buttons. The WEM 4 way foot-switch unit is a convenient way to use all 4 foot-controls.

Press and hold the footswitch down (with your foot ?) and whilst holding it down, press and release the button you want to assign to it e.g. Solo/Forte button. Release the footswitch.

Now, whenever this footswitch is pressed it will be the same as pressing the selected button in this example, the Solo/Forte button. So, you can assign four different instrument buttons to change or the Mute buttons so you can bring in another layer of sounds on the right-hand or the Octave or bass/chord change buttons for variations in performance or the drum select buttons etc.

The footswitch assignment is remembered permanently (even with power off) until changed again, so when you power-up you can just press the footswitches to get your last used sounds.


Advanced facilities – Sound changing using the Sound Programming (AKA ‘sound-try-out’) mode.

By entering a special programming mode, each instrument select button may be assigned to 1 of 128 different sounds that are available including its own reverberation setting, so you can actually create your own expander with your own preferred sounds. If changing sounds gets out of hand and you want to start again, the WEM factory sounds are easily reset. The list of instrument sounds is basically the General MIDI standard selection of 128 sounds; see the Sounds sheet for a list plus a blank (no sound) at position 129. If you decrement down from sound 1 it will go to sound 129 or increment up from sound 129 will go to sound 1.

The reverberation setting is also stored so if you wish you can just change the reverb setting without changing the instrument sound.

To enter the sound-programming or ‘sound-try-out’ mode in normal play mode, hold down the Bass bank and Rh2 mute buttons simultaneously, all lights will clear and then the Rh1 & Rh2 mute lights will flash to let you know you are in this mode. By pressing the same buttons again, you can quickly exit this mode back to normal playing mode.

Previously this mode could only be entered as a ‘power-up’ option by holding Right-hand 1 Mute button and then switching on the power, holding the button until the power light is on. This has been left as before, though the new method is probably preferable.  The mute lights will flash to indicate that you are in the sound-programming mode.

You can use two footswitches plugged into footswitch sockets 1 & 2 or the two right hand mute buttons to step through the sounds. Footswitch 1 or Mute Rh2 will step up (increment) through the list of sounds and footswitch 2 or Mute Rh1 will step back down again (decrement) through the list of sounds. Note that the ‘Mute’ buttons now have a different function i.e. they ‘scroll’ through the table of sounds – they no longer function as ‘mute’ buttons in this mode. You will have to turn down the volume of Right-hand 1 while you listen to the different sounds on right-hand 2 and vice versa as both right-hand sections will sound as you play the accordion to audition the sounds.

All the other controls will otherwise work as normal. It may be best to try changing Right-hand 2 or the Chords sounds first as these are single instrument sounds. Some right-hand-1 and some bass sounds have 2 or 3 layers of instruments and the sound programming mode only allows you to change the main layer, so some sound changes may not be that successful on these sections.

To change a sound:

First ; Press the sound select button you want to change. Play the appropriate part of the accordion to hear the existing sound. Now as you play, press one of the 2 footswitches or Mute buttons. Each time you press the footswitch or button, the sound will change to the next in the list.

To store the sound, just press the sound select button again. The reverberation level setting of the sound is stored so you may wish to adjust this as well. You may further change the sound and it will only be stored if you press the sound select button each time. When you are done, press the next button you wish to program and continue. If the button is not pressed a second time, then the currently heard sound will not be written in to that button, which is good if you decide not to change the particular setting – just press the next button you would like to try a change on.

Some instrument select buttons have effects such as chorus, vibrato and other edited parameters on them and these will be effective on any new sound that is programmed into the particular button, so it may be necessary to put appropriate sounds in certain positions. Also, some buttons have layered sounds and one layer is fixed so you will only be able to alter one of the instruments, so it is best to start with the right-hand 2 section as these are all single sounds. Right-hand 1 has all layered sounds (2 and 3 layers) which may be confusing as only one of the sounds will change as you scroll through the sound list. The chords are all single layered but some bass sounds are 2 layered.

Also remember that sound 129 is blank i.e. nothing will happen at all.

If Right-hand 1 Mute and Rh1-12 buttons are held down together at power up, then the MT32 sound bank is selected. Load factory presets to clear back to the GM bank.

If you want to reload the WEM factory presets so that the expander is returned to its original condition, press and hold the Chord Bank button while applying the power. Hold the button until the power light comes on.

See the controls and functions reference pages for a complete list.

Use as a GM (General MIDI) module.

The unit may be used as a GM module by holding the Right-hand 2 mute button and powering up. Hold the button until the power light comes on.

This mode is useful for feeding the unit from a computer or other MIDI sequencer that selects all the settings. via MIDI (some MIDI accordions will do this).  Only the Master volume control is functional in this mode. The  power light should be on and will flash its complementary colour upon receipt of a MIDI signal.

The unit responds to the basic GM standards on all 16 MIDI channels. An MT32 sound bank is available by sending the appropriate Bank select message. See the MIDI sound and implementation sheets.

By powering up with no buttons pressed down, normal (WEM) playing mode is entered. See the quick reference sheet for an overall list of operating modes.

Trouble shooting.

Q.: Everything is fine until I plug in a footswitch, then, the buttons don’t work properly.

A.: You probably have the wrong polarity type of footswitch or a faulty (shorting) one.
You need a normally - open contacts, non-latching type, sometimes referred to as ‘sustain-pedal’ type as used on some keyboards. This is the simplest type of footswitch mechanism and has been chosen for its robustness.

Use the WEM quad footswitch unit for guaranteed results.

Q.:  The volume or some other settings seem to change occasionally.

A.:  Check that your accordion is not sending out MIDI commands to make the changes. You can cancel all control messages that may do this by powering up whilst holding the bass bank button. This button toggles (switches alternately) to a notes only mode. The Notes only mode is the default setting from the factory-preset load (power up with chord button held) and makes the Midi Partner only respond to the minimum of MIDI messages and so it will ignore many messages that an accordion may send which are not necessary for basic playing and which may produce unexpected effects. 

If your MIDI Partner seems slightly different than the above instructions imply or different from another MIDI Partner you have heard, then this may be due to version differences, WEM occasionally change features in response to feedback from users. The latest system may be programmed into any unit by WEM. Call for details if this is of interest to you.


Midi Partner was designed as an ‘antidote’ to the over-complex expanders that once dominated the market. Obviously to do this, some apparent sacrifices have to be made in the facilities available but as it was designed by accordionists for accordionists, what is has got, is targeted to the accordionists needs and to the needs of people who just want to plug in and get the benefits of electronic sounds without the hassle of learning to use a complex unit.


To use the Watkins acronym for the philosophy, it is NYBWC (pronounced NIB WICK) which translates as “No You Bloody Well Can’t” :  Basically this answers all the people who ask “Can I do this and can I do that with it ?” …  …NYBWC!

This isn’t to say that we don’t listen to everyone’s requirements, ‘demands’ and suggestions – we do and if universally applicable we may try to act on it. E.g. the master tune was implemented for someone who had an accordion apparently somewhat detuned from concert pitch and is now a permanent feature.

Electrical Specifications.

Footswitch type :  Normally open contacts, press to close, non-latching, also called sustain pedal type. Quarter inch mono jack plug fitted.

Power unit : 7.5 -> 10 Volt AC or 9 -> 12 Volts DC of either polarity at 300mA or greater recommended (Actual consumption is 200mA Max). 2.5 mm power plug.  No memory backup batteries required.

Audio out : normal line out levels of around 1V.RMS on quarter inch mono jack socket. This output will also drive ordinary medium impedance stereo headphones for personal practice. 

MIDI and performance

Standard MIDI IN and MIDI THRU sockets provided.

Normal WEM playing mode (power on ‘factory’ default) MIDI channel assignments:

Bass on              Ch 3

Chords on          Ch 2

Right-hand 1 on   Ch 1

Right-hand 2 on   Ch 1 (or Ch4 if sent separately). 

Recognised messages in normal play (minimum) mode:

Note On With velocity, Note Off, Active sensing,

If the extended MIDI mode is selected (power on holding chord bank) then you can activate some Control-change message reception, the selection includes Sustain, Volume, Modulation, Pitch-bend, Program change. Do the same again to cancel this mode or load ‘factory presets’.

Normally Rh2 will play along with Rh1 but if MIDI is received on Channel 4 then the Right-hand 2 (Rh2) controls will automatically switch to Ch4, so Rh2 may be played separately from Rh1. Once this has happened, to make Rh2 go back to Ch1, restart the unit i.e. switch off and then on again.

38 note polyphony in total is available i.e. the module will play up to 38 notes at a time depending on the particular sounds selected. Some right-hand sounds have up to 4 layers of instruments.

(For compatibility with the ‘Cavagnolo’ electronic accordion system, it will also respond to channels 14, 15 & 16. Right-hand on channel 16, chords on channel 14 and bass on channel 15 if set to do so – see the ‘Power-on Functions’ chart).

Programming or ‘sound-try-out’ mode :

As normal mode but with selection of 128 sounds and the reverb setting programmable into the 46 instrument selection buttons with footswitches 1 & 2 or Mute Rh1 & Mute Rh2 used for stepping through the available sounds.

This mode may be entered or exited during normal playing mode by holding the Bass bank and Rh2 mute buttons simultaneously. The Rh1 & Rh2 mute lights will flash to let you know you are in this mode.

GM Mode :

As basic GM standard, 16 channels, 128 GM sounds  with percussion on Ch 10, reverb, chorus, vibrato,  38 note polyphony. MT32 sound bank available. See MIDI implementation sheet.

Terms used.

Rh1 or Rh2 are respectively right-hand 1 and right-hand 2. They are the set of sounds and controls assigned to the accordion right-hand keyboard. There are 2 sections on the MP1 so that sounds can be layered by having selections from both parts on at the same time or they can be swapped over or brought in by hand or foot-switch. Rh2 can be played separately by MIDI in on Ch4 with Rh1 on Ch1. Once channel 4 is received, Rh2 will not respond to channel 1 again until the unit is switched off and on again to reset this function.

GM is the General MIDI standard of compatible instrument sounds and controls.


Designed and built by Watkins Electric Music Ltd, London, UK.                                  MP1v003a

WEM MIDI Partner  MP1 MkII - Controls and hidden functions, quick reference.     v2.0

Power-up setting changes.  – Turn on the unit while holding the indicated buttons until the power light comes on.

To enter the sound programming mode :

(This lets you change the sounds on the Midi




May be entered through normal play mode now – see normal play mode changes.

Hold Mute Rh1 and apply power. Next press the button of the sound you want to change. Footswitches 1 & 2 or the Mute Rh1 & 2 buttons decrement or increment through the list of sounds. The Mute 1&2 lights flash to let you know you are in programming mode. The reverb level that you set is also stored. Press the chosen sound button again to store the new sound.

You need only use this method of entry if you want to use the footswitches to step through the sounds.

To exit the sound programming mode  :

Switch off power. When you switch on again, you will be in the normal playing mode.


To load factory preset sound selection :

Hold Chord Bank and apply power. The users sounds are erased and the memory is filled with the WEM preset sounds and values.

To enter the General MIDI module mode :

 (This mode is for use with computers or

accordions with their own sound patches and

controls on them).

Hold Rh2 Mute and apply power. The expander becomes a 16 channel GM module. Only the Master volume and power/activity light function to show reception of MIDI. To exit:  switch power off, unit will power up again as a MIDI Partner.

To Enable MIDI reception of Control messages : Program Change, Pitch wheel, Sustain, Volume, Modulation :

Hold Bass Bank and apply power. This is remembered permanently. Factory default is minimal notes only mode.

To Disable the above – (notes only mode) : 

This makes sure that the unit only responds to

wanted MIDI messages.

Hold Bass Bank and apply power again. This is remembered.

To check the modules sound output,     without a MIDI input :

(Proves the sound synthesiser is functioning).

Press and hold Rh2-7 & Rh2-12 and then apply power. Produces a high volume sine tone output. Keep Master Volume down low to start with. Press Rh2-8 & Rh2-11 to enter normal mode again.

To enable MIDI reception on 14,15 & 16 :

(Chords 14, Bass 15, Right hands 16).

Press and hold Rh2-1 & Rh2-6 and then apply power. Setting is remembered. Load factory presets to reinstate. For use with Cavognolo accordions.

To enable RH to play the Bass section :       

Hold Rh1-1 & Rh1-6 and power up. Setting is remembered.  Do again to cancel.


Normal play mode operation changes. These buttons may be pressed at any time during normal use.

To Enter Sound programming mode :






To Exit Sound programming mode :

Hold Bass bank & Rh2 Mute buttons together, then release. The Mute 1&2 lights flash slowly while in this sound try-out mode. Next press the button of the sound you want to change. The Mute Rh1 & 2 buttons decrement or increment through the list of sounds. Press the chosen sound button again to store the new sound.


 =>do the same again, you will enter normal play mode.

To change the overall pitch.(Master Tune) :

Hold Rh2 Mute button for about 1.5 secs until the Rh2 Mute light starts flashing. Rh2 Reverb control is now Master tune control. (+- 1/8 tone). Press button again to exit. Setting is remembered.

To change the volume of the Drums :

Hold in the drum button to be edited for over 1.5 seconds; when the bass & chord lights flash rapidly, the button may be released and the drums volumes may be adjusted using the bass & chord reverb controls. Press the button again to store the setting and exit. The volume setting is remembered permanently or until changed again.

To change the Tremolo speed  & Depth : 

Hold in tremolo button for over 1.5 seconds, when the Rh1 & Rh2 lights flash rapidly, the tremolo speed may be adjusted using the Rh2 reverb control. The depth is changed using Rh1 reverb control. Press the button again to store the setting and return to normal.  The settings are remembered permanently. The button may be assigned to one of the footswitches for hands-free editing.

To change the Hawaiian pitch bend amount :

Hold in Hawaiian button until the Rh1 & Rh2 lights start to flash. The bass reverb control changes the slide time. The chord reverb control changes the max pitch down (1 tone max). Hold the button down until the lights stop flashing to store and exit.

To change the Solo/Forte level :

Press and hold the Solo button until the bass bank light flashes. The bass reverb control will adjust the solo level. Press the solo button again to store and exit to normal.

The Octave buttons on the right-hands will have different effects on different sounds. Some will go up some down, on some, only one layer affected.

The octave changes cancel when a new right-hand sound is selected.

To Enable the alternating mute on Rh1 to Rh 2 :

(For the Mute buttons :

Light On = Sound On, Light Off = sound Off).

During normal operation, press Rh1 Mute and Rh2 Mute together. Rh2 Mute alternately swaps the active Right-hand from 1 to 2 to 1 etc. Rh1 Mute disables this mode and returns back to the normal independent mute function.

A press of a sound button will select a new sound.

On the right-hand sounds, pressing the same button again will mute the sound – the Mute light will go off to show this. The mute button or a sound button may be pressed to bring back a sound.

Pressing the same button again on the chords or bass will have no permanent effect though it will cut any held notes.

The bass and chord Bank buttons select an alternative instrument on each of the sound select buttons giving an extra 5 bass and extra 6 chord sounds.

Button 6 on the bass section is the bass-shift button. This effectively lowers the bass range by half an octave, allowing you to escape the single octave range of the accordion.

In any editing or setting modes, the reverb controls become the editing value controls. The light flashing next to it will show which of the controls is operational at that time for editing. Turning an editing control will make the power light flash with each change of the control.

Any of the 4 footswitches may be assigned to any of the buttons on the unit. Press the chosen footswitch and hold it down. Whilst holding it, press the button to assign to it. Release the footswitch. The footswitch now does the same as the button does. This assignment is remembered with power off.

 WEM  MIDI  Partner  MP1 MkII,  General  MIDI  Sound  chart. 

This is the list of the basic sounds inside the MP1. In sound programming (sound-try-out) mode, they may be stepped through using Footswitch 1 & 2 or the Right-hand Mute buttons in the numerical order indicated and sounds from the list substituted for the existing sounds. Some of these sounds use 2 instruments and therefore use up more of the available notes – 38 notes simultaneously maximum, this includes drum sounds.

If you go down from sound 1, you will go to sound 129 and if you go up from sound 129, you will go to sound 1.

In General MIDI (GM) mode, the numbers represent the MIDI Program (patch) Change numbers (bearing in mind MIDI starts at 0 not 1, you may have to subtract 1, depending on your system) and it responds on all 16 MIDI channels except 10. There is a separate sheet detailing the GM drums on channel 10.

Piano Bass Reed Effects
1   (Grand) Piano 1

2   (Bright)Piano 2

3   (El Grd)Piano 3

4   Honky-Tonk Piano

5   EL Piano 1

6   El Piano 2

7   Harpsichord

8   Clavi
33   Acoustic Bass

34   Finger Bass

35   Picked Bass

36   Fretless bass

37   Slap Bass 1

38   Slap Bass 2

39   Synth Bass 1

40   Synth Bass 2

65   Soprano Sax

66   Alto Sax

67   Tenor Sax

68   Baritone Sax

69   Oboe

70   English Horn

71   Bassoon

72   Clarinet

 97   FX 1 (rain)

 98   FX 2 (soundtrack)

 99   FX 3 (crystal)

100   FX 4 (atmosphere)

101   FX 5 (brightness

102   FX 6 (goblins)

103   FX 7 (echoes)

104   FX 8 (sci-fi)

Malet Strings Pipes Ethnic
 9   Celesta

10   Glockenspiel

11   Music Box

12   Vibraphone

13   Marimba

14   Xylophone

15   Tubular Bells

16   Santur

41   Violin

42   Viola

43   Cello

44   Contrabass

45   Tremolo Strings

46   Pizzicato Strings

47   Orchestral Harp

48   Timpani

73   Piccolo

74   Flute

75   Recorder

76   Pan Flute

77   Blown Bottle

78   Shakuhachi

79   Whistle

80   Ocarina

105   Sitar

106   Banjo

107   Shamisen

108   Koto

109   Kalimba

110   Bagpipe

111   Fiddle

112   Shanai

Organ String Ensemble Lead Percussion
17   Drawbar Organ

18   Percussive Organ

19   Rock Organ

20   Church Organ

21   Reed Organ

22   Accordion (French)

23   Harmonica

24   Tango Accordion

49   String Ensemble 1

50   String Ensemble 2

51   Synth Strings 1

52   Synth Strings 2

53   Choir Aahs

54   Voice Oohs

55   Synth Voice

56   Orchestra Hit

81   Lead 1 (square)

82   Lead 2 (sawtooth)

83   Lead 3 (calliope)

84   Lead 4 (chiff)

85   Lead 5 (charang)

86   Lead 6 (voice)

87   Lead 7 (fifths)

88   Lead 8 (bass+lead)

113   Tinkle Bell

114   Agogo

115   Steel Drums

116   Woodblock

117   Taiko Drum

118   Melodic Tom

119   Synth Drum

120   Reverse Cymbal

Guitar Brass Pads Sound Effects
25   Ac. Guitar (nylon)

26   Ac. Guitar (steel)

27   El. Guitar (jass)

28   El. Guitar (clean)

29   El. Guitar (muted)

30   Overdriven Guitar

31   Distortion Guitar

32   Guitar Harmonics

57   Trumpet

58   Trombone

59   Tuba

60   Muted Trumpet

61   French Horn

62   Brass Section

63   Synth Brass 1

64   Synth Brass 2

89   Pad 1 (fantasia)

90   Pad 2 (warm)

91   Pad 3 (polysynth)

92   Pad 4 (choir)

93   Pad 5 (bowed)

94   Pad 6 (metallic)

95   Pad 7 (halo)

96   Pad 8 (sweep)

121   Gt. Fret Noise

122   Breath Noise

123   Seashore

124   Bird Tweet

125   Telephone Ring

126   Helicopter

127   Applause

128   Gunshot

129   Blank (No sound)

WEM MP1 : Drumset Variations for GM Mode on MIDI Channel 10.

* = No sound
Blank = Same sound as "Standard Set".
[EXC] = Sounds with same EXC number are mutually exclusive. 

Drumset Variations :- 

Note Number. Prog 1: Prog 17: Prog 41: Prog 49: Prog 127:
Standard Set Power Set Brush Orchestra CM -64/32 (Partial)

27 - D#1 Closed Hi Hat *
28 - E1 Pedal Hi-Hat *
29 - F1 Open Hi-Hat *
30 - F#1 Ride Cymbal *
31 - G1 *
32 - G#1 *
33 - A1 *
34 - A#1 *
35 - B1 Kick drum2 Jazz BD 2 Kick drum
36 - C2 Kick drum1 Jazz BD 1 Kick drum
37 - C#2 Side Stick Rim Shot
38 - D2 Snare Drum 1 Gated Snare Brush Tap Snare Drum 2 Snare Drum
39 - D#2 Hand Clap Brush Slap Castanets Hand Clap
40 - E2 Snare Drum 2 Brush Swirl Snare Drum 2 Elec Snare Drum
41 - F2 Low Floor Tom Timpani F Acoustic Low Tom
42 - F#2 Closed Hi-Hat [EXC1] Timpani F# Closed Hi-Hat[EXC1]
43 - G2 High Floor Tom Timpani G Acoustic Low Tom
44 - G#2 Pedal Hi-Hat [EXC1] Timpani G# Open Hi-Hat 2
45 - A2 Low Tom Timpani A Acoustic Middle Tom
46 - A#2 Open Hi-Hat [EXC1] Timpani A# Open Hi-Hat 1[EXC1]
47 - B2 Low-Mid Tom Timpani B Acoustic Middle Tom
48 - C3 Hi Mid Tom Timpani C Acoustic High Tom
49 - C#3 Crash Cymbal 1 Timpani C# Crash Cymbal
50 - D3 High Tom Timpani D Acoustic High Tom
51 - D#3 Ride Cymbal 1 Timpani D# Ride Cymbal
52 - E3 Chinese Cymbal Timpani E *
53 - F3 Ride Bell Timpani F *
54 - F#3 Tambourine Tambourine
55 - G3 Splash Cymbal *
56 - G#3 Cowbell Cowbell
57 - A3 Crash Cymbal 2 *
58 - A#3 Vibraslap *
59 - B3 Ride Cymbal 2 *
60 - C4 Hi Bongo
61 - C#4 Low Bongo
62 - D4 Mute Hi Conga
63 - D#4 Open Hi Conga
64 - E4 Low Conga
65 - F4 High Timbale
66 - F#4 Low Timbale
67 - G4 High Agogo
68 - G#4 Low Agogo
69 - A4 Cabasa
70 - A#4 Maracas
71 - B4 Short Whistle [EXC2]
72 - C5 Long Whistle [EXC2]
73 - C#5 Short Guiro [EXC3] Vibra Slap
74 - D5 Long Guiro [EXC3] *
75 - D#5 Claves Claves
76 - E5 Hi Wood Block *
77 - F5 Low Wood Block *
78 - F#5 Mute Cuica [EXC4] *
79 - G5 Open Cuica [EXC4] *
80 - G#5 Mute Triangle [EXC5] *
Note Number. Prog 1: Prog 17: Prog 41: Prog 49: Prog 127:
Standard Set Power Set Brush Orchestra CM -64/32 (Partial)

81 - A5 Open Triangle[EXC5] *
82 - A#5 Applause
83 - B5 *
84 - C6 *
85 - C#6 *
86 - D6 *
87 - D#6 *
88 - E6 Applause *
89 - F6 *
90 - f#6 *
91 - G6 *
92 - G#6 *
93 - A6 *
94 - A#6 Helicopter
95 - B6 *
96 - C7 Gunshot
97 - C#7 *
98 - D7 *
99 - D#7 *
100 - E7 *
101 - F7 *
102 - F#7 Birds
103 - G7 *
104 - g#7 *
105 - A7 *
106 - A#7 Seashore

WEM MP1. General MIDI mode : recognised message details. 

NOTE ON 9nh kk vv MIDI channel n(0-15) note ON #kk(1-127), velocity vv(1-127).
vv=0 means NOTE OFF

NOTE OFF 8nh kk vv MIDI channel n(0-15) note OFF #kk(1-127), vv is don't care. 

PITCH BEND Enh bl bh Pitch bend as specified by bh|bl (14 bits). Maximum swing is±1 tone (power-up). 
Can be changed using "pitch bend sensitivity". Center position is 00h 40h.

PROGRAM CHANGE Cnh pp Program (patch) change. Specific action on channel 10 (n = 9):select drumset. 
Refer to sounds /drumset list. Drumsets can beassigned to other channels (see SYSEX MIDI channel-to-part assign and part-to-rhythm allocation)

CHANNEL Aftertouch Dnh vv vv pressure value. Effect set using Sys. Ex. 40h 2nh 20h-26h 

MIDI RESET FFh Reset to power-up condition

CTRL 00 Bnh 00h cc Bank select MSB : Refer to sounds list. No action on drumset. 
CTRL 01 Bnh 01h cc Modulation wheel. Rate and maximum depth can be set using SYSEX.
CTRL 05 Bnh 05h cc Portamento time. 
CTRL 06 Bnh 06h cc Data entry: provides data to RPN and NRPN 
CTRL 07 Bnh 07h cc Volume (default = 100) 
CTRL 10 Bnh 0Ah cc Pan (default = 64 center) 
CTRL 11 Bnh 0Bh cc Expression (default = 127) 
CTRL 64 Bnh 40h cc Sustain (damper) pedal 
CTRL 65 Bnh 41h cc Portamento on/off 
CTRL 66 Bnh 42h cc Sostenuto pedal 
CTRL 67 Bnh 43h cc Soft pedal 
CTRL 80 Bnh 50h vv Reverb program vv = 00h to 07h (default 04h)
00h: Room1
01h: Room2
02h: Room3
03h: Hall1
04h: Hall2
05h: Plate
06h: Delay
07h: Pan delay
CTRL 81 Bnh 51h vv Chorus program vv = 00h to 07h (default 02h).
00h: Chorus1
01h: Chorus2
02h: Chorus3
03h: Chorus4
04h: Feedback
05h: Flanger
06h: Short Delay
07h: FB Delay

CTRL 91 Bnh 5Bh vv Reverb send level vv = 00h to 7Fh 
CTRL 93 Bnh 5Dh vv Chorus send level vv = 00h to 7Fh 
CTRL 120 Bnh 78h 00h All sound off (abrupt stop of sound on channel n).
CTRL 121 Bnh 79h 00h Reset all controllers 
CTRL 123 Bnh 7Bh 00h All notes off .
CTRL 126 Bnh 7Eh 00h Mono on.
CTRL 127 Bnh 7Fh 00h Poly on (default power-up).
CTRL CC1 Bnh cch vvh Assignable Controller 1. cc = Controller number (0 - 5Fh),
vv = Control value (0 - 7Fh). Control number (cch) can be set
on CC1 CONTROLLER NUMBER (Sys. Ex 40 1x 1F). The
resulting effect is determined by CC1 controller function (Sys.Ex. 40 2x 40-4A).

CTRL CC2 Bnh cch vvh Assignable Controller 2. cc = Controller number (00h - 5Fh), vv = control value 
(0 - 7Fh). Control number can be set on CC2 CONTROLLER NUMBER 
(Sys.Ex. 40 1x 20). The resulting effect is determined by CC2 controller function (Sys.Ex.40 2x 50-5A).
RPN 0000h Bnh 65h 00h 64h 00h 06h vv Pitch bend sensitivity in semitones (default = 2) 
RPN 0001h Bnh 65h 00h 64h 01h 06h vv Fine tuning in cents (vv = 00 -100, vv = 40h 0, vv = 7Fh +100) 
RPN 0002h Bnh 65h 00h 64h 02h 06h vv Coarse tuning in half-tones (vv = 00 -64, vv = 40h 0, vv =7Fh +64)

There are more NRPN and SYSEX functions if required ask for Details.

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