<html><head></head><body style="zoom: 0%;"><div dir="auto">Hello Jeffrey, <br><br></div> <div dir="auto">Thank you for the reply!<br><br></div> <div dir="auto">I will look into that. <br></div> <div dir="auto">I am relatively new to linux, so I need to learn more about cpu throttling.<br><br></div> <div dir="auto">Fabio</div> <div class="gmail_quote" >On Nov 28, 2022, at 5:40 PM, Jeffrey Brown <<a href="mailto:jeffbrown.the@gmail.com" target="_blank">jeffbrown.the@gmail.com</a>> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> <div dir="auto"> 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. </div> <br> <div class="gmail_quote"> <div dir="ltr" class="gmail_attr"> On Mon, Nov 28, 2022, 4:20 AM Fabio G < <a href="mailto:fabio.forall@gmail.com">fabio.forall@gmail.com</a>> wrote: <br> </div> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> <div> <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"> </font><blockquote type="cite"><font face="monospace"> Do you have a "layer" between the drivers (alsa oss etc...) </font></blockquote><font face="monospace"> <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> On 2022-11-28 13:16, Patrick Pouget wrote: <br> </div> <blockquote type="cite"> <div style="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;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing: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="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;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none"> <br> </div> <div style="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;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none"> I can see 2 causes </div> <div style="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;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing: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="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;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing: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> <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! <u></u> <u></u> <a href="https://sound.stackexchange.com/posts/51899/timeline" aria-label="Timeline" aria-describedby="--stacks-s-tooltip-803qw2ou" target="_blank" rel="noreferrer"><u></u><u></u></a> </div> <div> <div> <br> </div> </div> <div> <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 noreferrer" target="_blank">this tutorial:<br> </a></p> <p><a href="http://www.tedfelix.com/linux/linux-midi.html" rel="nofollow noreferrer noreferrer" target="_blank">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" target="_blank" rel="noreferrer">JackAudio@lists.linuxaudio.org</a> <br> </div> <div> <a href="https://lists.linuxaudio.org/listinfo/jackaudio" target="_blank" rel="noreferrer">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> </blockquote> <br> </div> _______________________________________________ <br> JackAudio mailing list <br> <a href="mailto:JackAudio@lists.linuxaudio.org" target="_blank" rel="noreferrer">JackAudio@lists.linuxaudio.org</a> <br> <a href="https://lists.linuxaudio.org/listinfo/jackaudio" rel="noreferrer noreferrer" target="_blank">https://lists.linuxaudio.org/listinfo/jackaudio</a> <br> </blockquote> </div></blockquote></div></body></html>