[Jackaudio] Noise when using JACK in Linux Mint

[Jeffrey Brown]

Could CPU throttling be the problem? I have to disable it when I use synths
in JACK or else I get noise, dropouts and IIRC the occasional pop.

On Mon, Nov 28, 2022, 4:20 AM Fabio G <fabio.forall at gmail.com> wrote:

> Thanks a lot for your reply, Patrick!
> I will keep experimenting with different combinations of format settings.
>
> About this:
>
> Do you have a "layer" between the drivers (alsa oss etc...)
>
>
> I am not sure of what you mean (I am not an expert :) ).
> Of course the computer has alsa, but as far as I understand all the
> software involved (virtual keiboard, QSynth, JACK) are connected directly,
> without intermediaries.
> Can you give me some tests to do, to determine whether there is a layer in
> between or not?
>
> Again, thanks a lot!
>
> Fabio
>
> On 2022-11-28 13:16, Patrick Pouget wrote:
>
> White noise is, in general, due to format mismatch. I mean data types,
> sample rate, number of channels etc...
>
> I can see 2 causes
> * Jack should be queried for the format by the application. If you have
> the problem with many, it is not the case
> * jack relay on drivers that return wrong informations or no information
> or a default information. Do you have a "layer" between the drivers (alsa
> oss etc...) and jack?
>
>
> On Mon, 2022-11-28 at 09:14 +0100, Patrick Pouget wrote:
>
> White noise is, in general, due to format mismatch. I mean data types,
> sample rate, number of channels etc...
>
> I can see 2 causes
> * Jack should be queried for the format by the application. If you have
> the problem with many, it is not the case
> * jack relay on drivers that return wrong informations or no information
> or a default information. Do you have a "layer" between the drivers (alsa
> oss etc...) and jack?
>
>
>
> On Mon, 2022-11-28 at 09:03 +0500, Fabio G wrote:
>
> Hello to all! <https://sound.stackexchange.com/posts/51899/timeline>
>
> I am experimenting with audio production under Linux Mint 20.3  (based on
> Ubuntu 20.04). I managed to install a low latency kernel, then I have
> installed JACK, and Qsynth, following the steps described in this
> tutorial:
> <http://www.tedfelix.com/linux/linux-midi.html>
>
> http://www.tedfelix.com/linux/linux-midi.html
>
> Everything seems to work fine if I use Qsynth and pulseaudio: I use the
> vmpk simple virtual keyboard, and I have good output sound.
>
> I have also tested JACK, as suggested in the tutorial using
>
> $ jack-play test.wav
>
> and I hear the right clean output.
>
> However, when I tell Qsynth to use JACK, I have a lot of noise. When I hit
> a key I have "white noise" for few milliseconds instead of the key sound,
> and only when it fades I have a little bit of the note that I was supposed
> to play.
>
> I have the same "white noise" problem is I use Rose Garden.
>
> I have tried to change the sample rate and the frames/period settings, and
> also the Timeout, in JACK, but the problem stays the same.
>
>
> Thank you in advance for any help you can give.
>
>
> Best,
>
>
> Fabio
> _______________________________________________
> JackAudio mailing list
> JackAudio at lists.linuxaudio.org
> https://lists.linuxaudio.org/listinfo/jackaudio
>
>
>
>
> _______________________________________________
> JackAudio mailing list
> JackAudio at lists.linuxaudio.org
> https://lists.linuxaudio.org/listinfo/jackaudio
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.linuxaudio.org/archives/jackaudio/attachments/20221128/905e3665/attachment.html>