[LAD] JACK Graph Internal Latency? (was Re: A small article ...)

Louigi Verona louigi.verona at gmail.com
Thu Apr 29 09:27:21 UTC 2010

My version is 0.44, I think. pretty late one, I compiled ot from git in
February or January.
I can try another version or another app for that matter. But let Paul tell
us if it makes sense at all.

On Thu, Apr 29, 2010 at 1:25 PM, Ralf Mardorf <ralf.mardorf at alice-dsl.net>wrote:

> Louigi Verona wrote:
>> Hey guys!
>> I was the one who tested this for Mike. I used Qtractor and Rakarrack.
>> In Qtractor I had Audio track 1 and Audio track 2.
>> Signal from track 1 was routed into Rakarrack and then into track 2.
>> The latency is there and quite audible.
>> Louigi.
> Maybe it has nothing to do with this:
>   -------- Original Message --------
>   Subject:     Re: [LAD] JACK Graph Internal Latency? (was Re: A small
>   article ...)
>   Date:     Thu, 29 Apr 2010 11:17:31 +0200
>   From:     Ralf Mardorf <ralf.mardorf at alice-dsl.net>
>   To:     michael noble <looplog at gmail.com>
>   CC:     linux-audio-dev at lists.linuxaudio.org
>   References:       <
> s2q339c30111004281945ke03e953dp404e0b63e42b563d at mail.gmail.com>
>   <m2yeb4b5e1d1004282041j67fd5bcek60636d345c38ba0f at mail.gmail.com>
>   <l2y339c30111004282258rfd24b69bo3f86bbd54235ff12 at mail.gmail.com>
>   <p2p339c30111004290202u6fec7788ka4b038632ac42c87 at mail.gmail.com>
>   [snip]
>   I also wonder why JACK's zero-copy implementation could cause issues
>   for
>   audio apps. There was an issue for Qtractor, anyway, until today I
>   believed that there is no latency when using JACK in any way, excluded
>   connections regarding to the sound card.
>   I never noticed a latency, but maybe it's because I used this insert
>   connections for time related FX only, e.g. flanger and delay.
>   Interesting to read about latency I never was able to hear.
>   Ralf
> But anyway, what version of Qtractor do you use? There was an issue related
> to a supposed zero-copy implementation for outdated versions of Qtractor,
> that a long time ago was fixed in SVN or even in the previously used CVS.
> Ralf
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