[chuck-users] Latency Vs Midi timings precision

[Julien Saint-Martin]

Hi Mario,

In qjackctl my config is (my parameters names are in French so maybe my
translation is not the exactly same) :
Samples/Period: 4096
Sample rate: 44100
Period/Buffer: 2

Midi Driver: None

I call ChucK (Jack version) with parameter --bufsize8192

What is the specific setup your are talking about ?

Thanks!
Julien



2018-03-19 15:16 GMT+01:00 Mario Buoninfante <mario.buoninfante at gmail.com>:

> Hi Julien,
>
> I work on Linux as well, using Jack as audio core. there's a specific
> setup I've got that uses ChucK as slave (an external hardware sends MIDI
> clock to it and Pure Data). I have to say I've never experienced  anything
> like this, but honestly this specific ChucK script I'm using is in sync
> with everything, but doesn't need to be super accurate. So I've never
> measured if performance in this situation. could you provide some info more
> about your settings? how are you setting latency? buffer size on Jack,
> ChucK?
>
> cheers,
> Mario
>
> 2018-03-19 11:11 GMT+00:00 Julien Saint-Martin <julien.saintmartin@
> googlemail.com>:
>
>> Hi there,
>>
>> I am trying to synchronize my ChucK Loops and Synth with a friend.
>> We use midi messages and I am Slave.
>> I use Linux with Jack server.
>>
>> To ensure ChucK processing without glitches I play with latency (usually
>> 186 ms).
>> But I noticed that perdiodic midi messages are randomly delayed (kind of
>> jitter of about 80ms) when received in ChucK.
>> I also noticed that the jitter decrease when I reduce Latency.
>>
>> Latency is not a problem for me, and it is needed for Chuck to compute
>> without glitches (XRun in Jack server).
>>
>> Do you know where the Jitter comes from (Linux, Jack, ChucK) ?
>> Is  there a solution to reduce it keeping some latency ?
>>
>> Happy Chucking,
>>
>> Julien
>>
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>
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