[Jackaudio] Noise when using JACK in Linux Mint

[Fabio G]

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

<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
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