<html><head> </head> <body><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"><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">this tutorial:<br></a></p><p><a href="http://www.tedfelix.com/linux/linux-midi.html" rel="nofollow noreferrer">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><div>_______________________________________________<br></div><div>JackAudio mailing list<br></div><div><a href="mailto:JackAudio@lists.linuxaudio.org">JackAudio@lists.linuxaudio.org</a><br></div><div><a href="https://lists.linuxaudio.org/listinfo/jackaudio">https://lists.linuxaudio.org/listinfo/jackaudio</a><br></div></blockquote><div><br></div><div><span></span></div></blockquote><div><br></div><div><span></span></div></body></html>