Re: [LAD] on the soft synth midi jitters ...

On Tue, Oct 05, 2010 at 09:51:35AM +0200, Arnout Engelen wrote: Yes, but it provides a simple way to improve an existing application using Jack-midi, withour requiring very deep changes to the audio code to make it fully 'sample accurate'. You will probably already have something like: jack_process (nframes) { read_jack_midi_data(); // read full buffer, create new notes, // mark those being released. synthesize(nframes); // audio processing for current notes } The latter call will already accept smaller values of nframes, so no changes at all should be necessary there. So the only changes required would be to read_jack_midi_data(), making it read the next required part of the midi buffer instead of all of it, and then put a loop around the two calls, dividing Jack's period into smaller ones. An occasional non-realtime safe call will do less damage as when using a real smaller period as its effect is amortised over the full longer period. This is how I added Jack-midi support to Aeolus. It has an internal 'period' of 64 frames which really can't be changed without rewriting all of it. Reading the midi data in slices of 64 frames and alternating this with the synthesis code provides a jitter of +/- 32 frames, which is probably OK (at least it is for an organ). Ciao, -- FA There are three of them, and Alleline.