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

Ralf Mardorf ralf.mardorf at alice-dsl.net
Thu Apr 29 09:28:10 UTC 2010

Ralf Mardorf 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 related to a supposed zero-copy implementation for outdated versions 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

Do you know that you also could do real insert connections using Qtractor?

More information about the Linux-audio-dev mailing list