[AudioI] Octo and kernel 6 (was Re: Difficuly getting OCTO to work with PureData (Ryan Stanley))

[Marc Lavallée]

Hi list and maintainer(s) of the Octo driver,

My advice to Ryan was useless, and after a few tests it appears that 
with kernel 6 (as used by the latest Raspian) there large noise (at 
maximum level),  generated internally, for all inputs.

https://github.com/Audio-Injector/Octo/issues/64

Marc

Le 2023-06-05 à 17 h 22, Marc Lavallée via People a écrit :
>
> Hi Ryan,
>
> My experience: it's better to use a realtime kernel or a newer version 
> of the kernel that support realtime scheduling (I had some success 
> with kernel 6.0) , even more on small computers (like the RPI). Also, 
> PureData is not the best software for low-latency audio 
> (Supercollider, for example, is much faster). Configuring Linux for 
> audio is tricky; you may try using this script to guide you: 
> https://codeberg.org/rtcqs/rtcqs. Or you can use a RPI OS already 
> configured for audio like https://blokas.io/patchbox-os/ ; I 
> personally don't have experience with a pre-configured OS for audio, 
> because I prefer to configure the OS myself.
>
> I hope it helps, and good luck!
>
> Marc
>
> Le 2023-06-05 à 15 h 59, Ryan Stanley via People a écrit :
>> Does anyone have any advice on this? I still am unable to get OCTO to 
>> work with PureData. Has anyone else had luck with it?
>>
>> Thanks,
>> Ryan Stanley
>> 904-806-8104
>>
>>
>> On Fri, Jun 2, 2023 at 8:06 AM 
>> <people-request at lists.audioinjector.net> wrote:
>>
>>
>>     Today's Topics:
>>
>>        1. Difficuly getting OCTO to work with PureData (Ryan Stanley)
>>
>>
>>     ----------------------------------------------------------------------
>>
>>     Message: 1
>>     Date: Thu, 1 Jun 2023 13:52:33 -0400
>>     From: Ryan Stanley <ryan7585 at gmail.com>
>>     To: people at lists.audioinjector.net
>>     Subject: [AudioI] Difficuly getting OCTO to work with PureData
>>     Message-ID:
>>            
>>     <CAJ6-2+nExxZdgXSGTxSo9U6fyQq-ugLyY9GRYYOdTJ+Mgdbupw at mail.gmail.com
>>     <mailto:CAJ6-2%2BnExxZdgXSGTxSo9U6fyQq-ugLyY9GRYYOdTJ%2BMgdbupw at mail.gmail.com>>
>>     Content-Type: text/plain; charset="utf-8"
>>
>>     Hello everyone. I was able to get the OCTO card working (in some
>>     ways) on
>>     my Raspberry Pi 4B after reverting to Raspbian Buster (version from
>>     2/5/2020), and following the manual installation instructions
>>     except for
>>     the part where you update the Linux Kernel. However it still is
>>     having
>>     trouble with PureData. When I send an input to an output, the
>>     audio passes
>>     through un-distorted... But when I insert any objects into the
>>     signal chain
>>     (even just a [*~ 0.5] volume reduction), everything gets garbled,
>>     almost
>>     like a bitcrush style distortion. It almost seems like what
>>     passes thru is
>>     some sort of weird multiplexed version of the audio or something.
>>
>>     Does anyone know what might be wrong?
>>
>>     Thanks,
>>     Ryan Stanley
>>     904-806-8104
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