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<font face="monospace">Thanks a lot for your reply, Patrick!<br>
I will keep experimenting with different combinations of format
settings.<br>
<br>
About this:<br>
</font><br>
<font face="monospace">
<blockquote type="cite">Do you have a "layer" between the drivers
(alsa oss etc...) </blockquote>
<br>
I am not sure of what you mean (I am not an expert :) ). <br>
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.<br>
Can you give me some tests to do, to determine whether there is a
layer in between or not?<br>
<br>
Again, thanks a lot!<br>
<br>
Fabio</font><br>
<br>
<div class="moz-cite-prefix">On 2022-11-28 13:16, Patrick Pouget
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:90cac18b8b8991b7586d2ee2abb20c393e09764c.camel@patrick.pouget.name">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-family: Cantarell; font-size: 14.666667px; font-style:
normal; font-variant-caps: normal; font-weight: 400;
letter-spacing: normal; orphans: auto; text-align: start;
text-indent: 0px; text-transform: none; white-space: normal;
widows: auto; word-spacing: 0px; -webkit-tap-highlight-color:
rgba(0, 0, 0, 0.4); -webkit-text-stroke-width: 0px;
text-decoration: none;">White noise is, in general, due to
format mismatch. I mean data types, sample rate, number of
channels etc...</div>
<div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-family: Cantarell; font-size: 14.666667px; font-style:
normal; font-variant-caps: normal; font-weight: 400;
letter-spacing: normal; orphans: auto; text-align: start;
text-indent: 0px; text-transform: none; white-space: normal;
widows: auto; word-spacing: 0px; -webkit-tap-highlight-color:
rgba(0, 0, 0, 0.4); -webkit-text-stroke-width: 0px;
text-decoration: none;"><br>
</div>
<div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-family: Cantarell; font-size: 14.666667px; font-style:
normal; font-variant-caps: normal; font-weight: 400;
letter-spacing: normal; orphans: auto; text-align: start;
text-indent: 0px; text-transform: none; white-space: normal;
widows: auto; word-spacing: 0px; -webkit-tap-highlight-color:
rgba(0, 0, 0, 0.4); -webkit-text-stroke-width: 0px;
text-decoration: none;">I can see 2 causes</div>
<div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-family: Cantarell; font-size: 14.666667px; font-style:
normal; font-variant-caps: normal; font-weight: 400;
letter-spacing: normal; orphans: auto; text-align: start;
text-indent: 0px; text-transform: none; white-space: normal;
widows: auto; word-spacing: 0px; -webkit-tap-highlight-color:
rgba(0, 0, 0, 0.4); -webkit-text-stroke-width: 0px;
text-decoration: none;">* Jack should be queried for the format
by the application. If you have the problem with many, it is not
the case</div>
<div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);
font-family: Cantarell; font-size: 14.666667px; font-style:
normal; font-variant-caps: normal; font-weight: 400;
letter-spacing: normal; orphans: auto; text-align: start;
text-indent: 0px; text-transform: none; white-space: normal;
widows: auto; word-spacing: 0px; -webkit-tap-highlight-color:
rgba(0, 0, 0, 0.4); -webkit-text-stroke-width: 0px;
text-decoration: none;">* 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?</div>
<br class="Apple-interchange-newline">
<div><br>
</div>
<div>On Mon, 2022-11-28 at 09:14 +0100, Patrick Pouget wrote:</div>
<blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px
#729fcf solid;padding-left:1ex">
<div>White noise is, in general, due to format mismatch. I mean
data types, sample rate, number of channels etc...</div>
<div><br>
</div>
<div>I can see 2 causes</div>
<div>* Jack should be queried for the format by the application.
If you have the problem with many, it is not the case</div>
<div>* 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?</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div>On Mon, 2022-11-28 at 09:03 +0500, Fabio G wrote:</div>
<blockquote type="cite" style="margin:0 0 0 .8ex;
border-left:2px #729fcf solid;padding-left:1ex">
<div> Hello to all!<svg aria-hidden="true"
class="js-saves-btn-unselected svg-icon iconBookmarkAlt"
width="18" height="18" viewBox="0 0 18 18"></svg> <a
class="js-post-issue flex--item s-btn s-btn__unset
c-pointer py6 mx-auto"
href="https://sound.stackexchange.com/posts/51899/timeline"
data-shortcut="T" data-ks-title="timeline"
data-controller="s-tooltip"
data-s-tooltip-placement="right" aria-label="Timeline"
aria-describedby="--stacks-s-tooltip-803qw2ou"
moz-do-not-send="true"><svg aria-hidden="true" class="mln2
mr0 svg-icon iconHistory" width="19" height="18"
viewBox="0 0 19 18"></svg></a></div>
<div class="votecell post-layout--left">
<div class="js-voting-container d-flex jc-center fd-column
ai-stretch gs4 fc-black-200" data-post-id="51899"><br>
</div>
</div>
<div class="s-prose js-post-body" itemprop="text">
<p>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 <a
href="http://www.tedfelix.com/linux/linux-midi.html"
rel="nofollow noreferrer" moz-do-not-send="true">this
tutorial:<br>
</a></p>
<p><a href="http://www.tedfelix.com/linux/linux-midi.html"
rel="nofollow noreferrer" moz-do-not-send="true">http://www.tedfelix.com/linux/linux-midi.html<br>
<br>
</a>Everything seems to work fine if I use Qsynth and
pulseaudio: I use the vmpk simple virtual keyboard, and I
have good output sound.</p>
<p>I have also tested JACK, as suggested in the tutorial
using</p>
<br>
<blockquote type="cite" style="margin:0 0 0 .8ex;
border-left:2px #729fcf solid;padding-left:1ex">
<p>$ jack-play test.wav</p>
</blockquote>
<p>and I hear the right clean output.</p>
<p>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.</p>
<p>I have the same "white noise" problem is I use Rose
Garden.</p>
<p>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.</p>
<p><br>
</p>
<p>Thank you in advance for any help you can give.</p>
<p><br>
</p>
<p>Best,</p>
<p><br>
</p>
<p>Fabio<br>
</p>
</div>
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</blockquote>
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<div><span></span></div>
</blockquote>
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<div><span></span></div>
</blockquote>
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