This guide explains how to install MIDI in a Wersi Bass Synthesizer using our OrganDonor interface.
Installation and pictures by AudioCircus . Thank you
You will need an organDonor with 3 switch boards. Each of the boards will control one octave of the synth.
The organDonor main board and switch boards can be fixed in the synth’s case as shown and need to be wired up as follows:
- For each switch board, connect the first 12 common signals using the solder bridges on the back
- Solder a wire to each common connection (3 wires total).
- Connect the 12 analog switch outputs using a common ribbon cable. We can provide such a cable on request, or you can crimp your own
Next, solder the 12 wires and the 3 common wires to the back of the board as shown here:
Organ Donor will also need power.
In the organDonor configurator, you can select the MIDI notes for the switches you used. After uploading the configuration, MIDI input should work.

