<br><br><div class="gmail_quote">2012/7/14 Rob Bothof <span dir="ltr"><<a href="mailto:rbothof@xs4all.nl" target="_blank">rbothof@xs4all.nl</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Dear List,<br>
<br>
I'm working on a diy midi-controller and running into some latency problems,<br>
the controller is a 'scratch disk' with with a pic microcontroller with usb.<br>
<br>
i've build an absolute encoder for it and i'm sending the data or angle as pitchbend data (for high resolution)<br>
the speed with which i'm sending the data is way beyond midi-standards, i know...<br>
<br>
now when i set up pd to use alsa audio (internal soundcard) and alsa midi, the device works perfect, very smooth..<br>
when i choose jackd as a soundcard, i'm getting getting latency on the midi input..midi input is falling behind,<br>
then picking up instantly, falling behind again and so on...like a sawtooth shape..<br>
<br>
the settings i choose for jackd have no effect on this..either when i'm using the internal soundcard via jackd -> alsa,<br>
or a firewire device via freebob...the latency problem is the same...also with higher audiobuffer settings there is no change<br>
in the latency<br>
<br>
I disabled alsa sequencer support in jack so midi is running straight to pd..<br>
<br>
i know i'm working out of midi standards, but any help to where the problem might be,<br>
or simular experiences, would be greatly appreciated...<br>
<br></blockquote><div><br>I can't be of much help, but I can chime in with a similar/related experience:<br>So far, each time I tried sending midi note messages from pd to something like Qsynth or Qsampler, using alsamidi via jack<br>
the timing is unacceptably messy. <br><img alt="Inline afbeelding 1" src="cid:ii_13887090964b3ac9"><br>resluts in:<br><img alt="Inline afbeelding 2" src="cid:ii_13887119afa47c6b"><br>you can clearly see the irregularity, and yes, it _is_ audible too... ;)<br>
<br><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
greets,<br>
Rob Bothof<br>
<br>
<br>
<br>
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