Midi for Roland RS-505 with organDonor


The Roland RS-505 version of OrganDonor offers the following features:

  • Fully polyphonic midi input for all 49 synthesizer notes and 24 bass notes
  • Bass section on a separate midi channel
  • Optionally control the register switches of the synthesizer section
  • Optional learn button to set midi channel.


The installation is relatively simple, but does require basic soldering skills. You will need to drill a hole for the midi socket.
Installation instructions can be found in this PDF.

User guide

Setting midi channel and keyboard offset

If the optional learn button is installed, it can be used to quickly change the midi receive channel of organDonor.

Connect midi out of a computer or keyboard to midi in of organDonor. Make sure not to send any notes.
Press the learn button and while it is pressed send a midi note on any midi channel. organDonor will set this note as the lowest note of the synthesizer and use its midi channel. These settings are saved.

Playing notes

Send midi notes on the configured midi channel (see above)
By default, the synthesizer section is on midi channel 1, the bass section on channel 2.

More configuration

Alternatively you may configure a lot of parameters using our organDonor configurator.
We recommend using the Roland RS-505 config file as starting point
1.) Save the file on your hard drive via right click -> save as
2.) in the configurator press “Load configuration” and select the file