I’d like to simply access the microphone array from chromium-browser context (running on the mated PI), to process via the excellent WebRTC or SpeechRecognition APIs.
Go here as a test on a Pi connected to Matrix.One.
https://www.webrtc-experiment.com/RecordRTC/
If you can record and playback from the latter page on the connected PI, you’ve answered my question, and please share how you did it. 
How to get the microphone array to work as a source in chromium-browser?
What is the .asoundrc file for this?
I’ve tried everything in this thread:
https://github.com/matrix-io/matrix-creator-malos/issues/23
Conceptually simple to test, but I can’t get sound to show up from browser context.
Thanks if you have any ideas here. I suppose the general solution would help for microphone access by any program, not just the browser context.