2012/7/14 Rob Bothof <[email protected]> > Dear List, > > I'm working on a diy midi-controller and running into some latency > problems, > the controller is a 'scratch disk' with with a pic microcontroller with > usb. > > i've build an absolute encoder for it and i'm sending the data or angle as > pitchbend data (for high resolution) > the speed with which i'm sending the data is way beyond midi-standards, i > know... > > now when i set up pd to use alsa audio (internal soundcard) and alsa midi, > the device works perfect, very smooth.. > when i choose jackd as a soundcard, i'm getting getting latency on the > midi input..midi input is falling behind, > then picking up instantly, falling behind again and so on...like a > sawtooth shape.. > > the settings i choose for jackd have no effect on this..either when i'm > using the internal soundcard via jackd -> alsa, > or a firewire device via freebob...the latency problem is the same...also > with higher audiobuffer settings there is no change > in the latency > > I disabled alsa sequencer support in jack so midi is running straight to > pd.. > > i know i'm working out of midi standards, but any help to where the > problem might be, > or simular experiences, would be greatly appreciated... > > I can't be of much help, but I can chime in with a similar/related experience: So far, each time I tried sending midi note messages from pd to something like Qsynth or Qsampler, using alsamidi via jack the timing is unacceptably messy. [image: Inline afbeelding 1] resluts in: [image: Inline afbeelding 2] you can clearly see the irregularity, and yes, it _is_ audible too... ;)
greets, > Rob Bothof > > > > ______________________________**_________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> http://lists.puredata.info/** > listinfo/pd-list <http://lists.puredata.info/listinfo/pd-list> >
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