23 Mar
2011
23 Mar
'11
4:43 p.m.
1) it depends on the synth
Do you know what the case is with supercollider? E.g. if I were to
forget about midi and just trigger sc synths directly from python using
this wrapper: http://trac2.assembla.com/pkaudio/wiki/SuperCollider
2) with JACK MIDI, there is zero latency and zero
jitter between two
applications. with ALSA MIDI, latency can be up to a few msecs, but is
generally on the order of tens of usecs. with ALSA, you don't have
deterministic scheduling of the apps (in general) and that is the main
source of the latency and jitter. in addition, the MIDI data arrives
(via ALSA) in the wrong thread, so there is some delay involved in
getting it injected into the synthesis (process()) thread without
locks. with JACK, the MIDI data arrives in the right thread, with
sample accurate timestamps.
Thanks - that's worth knowing.
Cheers.
andy :)