Re: Microtonal midi output

[Lukas-Fabian Moser]

Hi Graham,

Am 10.05.21 um 18:40 schrieb Graham Breed:
> I didn't write any C++ but I looked at the C++ code and it looks
> trivial to change the pitch bend messages to MTS.

"Trivial" is in the eye of the beholder :-), but it was easy enough for 
me to succeed.

> I tested with FluidSynth, and there's an update that I don't think I
> pushed.  I think it was that you need to use the all devices Device ID
> (0x7f) instead of the channel number.
That information literally saved my life just now: I'm in the process of 
creating some teaching material for tomorrow; timidity behaves strangely 
on my system, and FluidSynth didn't seem to use all of the tuning 
information in the MIDI file. The change in the Device ID you described 
was what did the trick, and there's no way I could have found this out 
by myself this evening.

Thanks much!

>    What would be more
> difficult is adding all the options so that either pitch bends or MTS
> would work — or remembering the current state so you only need to send
> a message when something changes.

Yes, that's what I had in mind also. Conceptually, it seems clear what 
to do (keep track of the 'current' tuning for each key for each 
channel), but one has to find the right place to hook this into 
LilyPond's rather involved wiring. That's a task for the upcoming holidays.

Best
Lukas