This retrofit kit for the Prophet 5 rev 2 adds the following MIDI control:

For incoming MIDI:
Any MIDI channel can be selected
Notes (MIDI note numbers 36 - 96) - transpose possible
Program change (numbers 1 - 40)
Pitchbend - (bends up and down a fifth)
Mod Wheel
Filter cutoff frequency (of low pass filter)
Resonance
Volume
Sustain (decay on-off)

By default:
pitchbend is controlled by pitchbend messages
mod wheel is controlled by Mod Wheel (CC#1) and also by Aftertouch messages
filter cutoff is controlled by CC#16
resonance is controlled by CC#17
Volume is controlled by MIDI volume (CC#7)
Sustain is controlled by Sustain (CC#64)

however, any controller or aftertouch or velocity can be mapped to control other things so for example velocity could be mapped to control volume.

For outgoing MIDI:
Any MIDI channel can be selected
Notes (MIDI note numbers 36 - 96) - transpose possible
Program changes 1 to 61 can be sent using a button press followed by a key press
No other MIDI can be sent - the retrofit is primarily intended to allow the synth to be played from a MIDI master keyboard or sequencer.

Hardware:
MIDI In, Out & Thru sockets
Push button (for programming the MIDI setup)
Setups are stored in non-volatile memory (Eeprom)

The kit comprises the following items:
Circuit board - fits in the base of the Prophet
Small pack - contains DIN sockets and mounting hardware
Large pack - contains cable assemblies
User instructions - How to change from default settings and general instructions
Fitting instructions - step by step fitting guide plus diagrams of where to connect what

All kits are fully checked and tested before despatch

Note: Our retrofit kits are not intended for installation by the end user. They should always be fitted by an experienced synth engineer.