29 Nov
2022
29 Nov
'22
7:24 a.m.
Hello Jeffrey,
Thank you for the reply!
I will look into that.
I am relatively new to linux, so I need to learn more about cpu throttling.
Fabio
On Nov 28, 2022, 5:40 PM, at 5:40 PM, Jeffrey Brown <jeffbrown.the(a)gmail.com>
wrote:
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(a)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
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