[AudioI] 4 Channel Output with Octo

[Marc Lavallée]

Hi Zach,

It's possible to use 2 cheap stereo USB module; there's two use cases, 
depending if sample accurate synchronization is required:

-sync not required (it should be just fine): with ALSA, use the first 
module for the headphones and the other for the speaker and the transducer.

-sync required: with JACK, use the zita-a2j application, but it's a bit 
more work (to avoid if possible)... : https://manpages.org/zita-a2j

Marc

Le 2022-11-29 à 13 h 02, Mason, Zach via People a écrit :
>
> Hi all,
>
> I’m attempting to make a Pi project which is comprised of a arcade 
> machine, with a single button input. It would be a branching audio 
> narrative (with visual elements, some fan/wind output, some water 
> spray and a arcade coin input potentially). However all these things 
> in brackets are perfectly achievable to me. The main issue I have is 
> concerning the audio side of things as follows:
>
> From the Pi the branching audio needs to be sent to 4 different channels.
>
> 2 channels for stereo audio to a set of headphones.
> 1 channel for mono audio to a speaker in the cabinet.
> 1 channel for mono audio to a series of tactile transducers.
>
> Each audio device needs to receive different audio at the same time 
> (for example ambient sounds plays through speakers, when you put 
> headphones a voice is already telling you to press a button and then 
> once the button is pressed music plays through headphones, the 
> speakers go quiet and the tactile transducers vibrate all simultaneously).
>
> How possible is this? If possible, is the octo soundcard the best 
> solution? It seems to be from all my research, but is a USB-audio 
> interface more optimal?
>
> Thanks for reading this and any advice you can give,
>
> Zach Mason, PhD Student
>
> Design Research Works
>
> Imagination Lancaster
>
>
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