> >Haven't written anything using MIDI and JACK (or LADSPA), but would it be poss > >ible to have a such system as with Cubase where the softsynths are plugins whi > >ch receive time-stamped MIDI events (time-stamp is an offset from the block be > >ginning in samples).
Either this (use audio sample clock) or use a common clock, i.e. have a UST timestamp for every MIDI message and audio buffer (audio frame time can then be estimated). IMHO the latter is better. > >The MIDI-through events that come into sequencer from the > > external MIDI (in) port always have an offset of zero so the synth renders th > >e data starting from the first sample in that block. This is not the right approach as it will cause jitter. [...] > there is no way to > accurately schedule anything under Linux with hard-timers unless by > accurately you mean either "resolution = HZ" or "resolution = RTC Hz" > or "resolution = audio interrupt frequency". I agree, however HZ=1000 should be usable for MIDI even without patches for improved scheduling. I believe HZ=1000 is in 2.5? --martijn
