Available Midi outputs:


Active Midi output:
Enter output number to select a different
Midi output:


Currently selected Midi channel for synth A: - enter a number (1-16) to select a different Midi channel:

Currently selected Midi channel for synth B: - enter a number (1-16) to select a different Midi channel:

Currently selected Midi channel for synth C: - enter a number (1-16) to select a different Midi channel:

For each channel, the slider in the bottom left sends out CC1, the slider in the bottom right sends out CC2 and the slider in the top left sends out CC3.
The slider in the top right sets the velocity value with which Midi notes are triggered.


Currently selected Midi channel for Master section: - enter a number (1-16) to select a different Midi channel:

The sliders in the master section send out CC 1 to 14 from left to right and top to bottom. The last slider (bottom right) sets the master pitch bend value for all channels.
You can use this to transpose the entire instrument on the fly: adjust the pitch bend range on your synthesizer(s) to set the desired transpose range.


12 EDO standard tuning
Use the buttons to switch between different keyboard styles and tuning schemes. All modes except 12 EDO standard tuning require a separate tuning file and
a synthesizer capable of microtuning. Tuning files and additional information can be found on this page.


This is the Arithmophone MIDI, a Midi interface for electronic instruments. For details and documentation please visit this page.

Concept, design and development by Chiel Zwinkels © 2025. Revision: 3.1a