[PD] midi latency pd -> alsa / jackd
Rob Bothof
rbothof at xs4all.nl
Sat Jul 14 22:26:11 CEST 2012
On 7/14/2012 10:04 PM, tim vets wrote:
>
>
> 2012/7/14 Rob Bothof <rbothof at xs4all.nl <mailto:rbothof at xs4all.nl>>
>
> 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.
> Inline afbeelding 1
> resluts in:
> Inline afbeelding 2
> you can clearly see the irregularity, and yes, it _is_ audible too... ;)
>
>
>
Hi Tim, thank you for the shared blues on midi timing ;)
what i find strange is that i do not use jack for midi, i disabled alsa
sequencer in jackd
so midi should go directly to pd.
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..
greets,
Rob
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