Re: alsa, jack output issue

[dAgeCKo <dagecko@free.fr>]

Le 04/02/2013 15:13, Raffaele Morelli a écrit :
> 2013/2/4 dAgeCKo <dagecko@free.fr <mailto:dagecko@free.fr>>
>
>     Le 30/01/2013 21:17, dAgeCKo a écrit :
>
>
>         I will first try, hopefully tomorrow, to test the cpu-scaling stuff,
>         when the problem will arise again. Then after, I'll try all your
>         suggestions.
>
>
>
>     The problem did not arise again. So it was difficult for me to try if
>     it was from the cpu-scaling thing.
>
>     Anyway, I changed the jack settings so that the latency is a bit higher:
>     I put samples/perdiod at 512, the frequency at 96000 Hz, the period/
>     buffer at 2. Then the calculated latency is 10.7 ms, which still looks
>     good.
>
>
> you are plugging your guitar directly into the sound card right?...
>   there's really no use in 96Khz, switch to 48Khz and choose a low
> latency settings instead beacuse 10.7ms latency is very ugly in your case.

I plug my guitar into an effect pedal (Zoom G1XN Ext) which in turns is 
plugged into a tube pre-amp (ART Tube MP), which is then plugged into my 
sound card.

Anyway, changing the frequency does not impact a lot on the latency, and 
even, a higher frequency gives me a better latency :)
What makes difference is the samples / perdiod and the period / buffer.
But it is not easy to have the expected latency, whether it is too low, 
whether it is too high.

So I put 256 samples / period and then I have 5.33 ms.
If I put 44100 as the sample frequency, then I have more than 10ms.
Strange, but it is reality (certainly hardware support ?)

> 0.02€