I want to write a MIDI processor on the computer that "detunes" specific tones and leaves the others intact. But up to now I only found the pitch wheel MIDI message to go into this direction. However, if I send a pitch wheel message, all tones are detuned. I only want it to be specific ones. Is there any way I can accomplish that with MIDI?
Or, more generally, how can one have "just scales" on MIDI?