[Jackaudio] Noise when using JACK in Linux Mint

[Patrick Pouget]

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!undefined 
> > 
> > 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
> > 
> > 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
> 

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