28 Nov
2022
28 Nov
'22
10:19 a.m.
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
<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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