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<div class="moz-cite-prefix">On 7/14/2012 10:04 PM, tim vets wrote:<br>
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<blockquote
cite="mid:CA+Bc=yPYO+=ZmZck+6TazQ1ctqnApKpnu77J7_SPwOfp4GFDjg@mail.gmail.com"
type="cite"><br>
<br>
<div class="gmail_quote">2012/7/14 Rob Bothof <span dir="ltr"><<a
moz-do-not-send="true" 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:part2.04050407.02070005@xs4all.nl"><br>
resluts in:<br>
<img alt="Inline afbeelding 2"
src="cid:part3.00080203.02070502@xs4all.nl"><br>
you can clearly see the irregularity, and yes, it _is_ audible
too... ;)<br>
<br>
<br>
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0.8ex; border-left: 1px solid rgb(204, 204, 204);
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<br>
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Hi Tim, thank you for the shared blues on midi timing ;)<br>
what i find strange is that i do not use jack for midi, i disabled
alsa sequencer in jackd<br>
so midi should go directly to pd.<br>
<br>
only thing i change is the audio card from alsa to jack...i don't
see how this would influence the midi, but it does..<br>
<br>
greets,<br>
Rob<br>
<br>
<br>
<br>
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