[Jackaudio] Noise when using JACK in Linux Mint

[Fabio G]

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 at 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 at 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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>>
>>
>>
>>
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