[PD] midi latency pd -> alsa / jackd

[Rob Bothof]

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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