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ALSA Configs for multi channel audio cards - GitHub
https://github.com/nicupavel/alsa-multitrack-soundcards
This repository holds ALSA configs for several multi channel cards that creates dsnoop devices that can be used directly by sound recording applications like darkice, arecord etc. Most of the multi channel cards internally have either multiple stereo inputs that needs to be split (ESI Maya/Julia) to map correct input connector to software input or a 8/16 channels on single …
Output to Multiple Audio Devices with Alsa - Eliot Eshelman
http://www.6by9.net/output-to-multiple-audio-devices-with-alsa/
Once you have your devices figured out and know which output plays where, you instruct ALSA to duplicate the audio output to both of the sound cards. This is the configuration that worked for me (install in ~/.asoundrc or /etc/asound.conf ) – the 2-channel settings are for the headphones (SoundBlaster Live) and the 4-channel settings are for the stereo (onboard …
alsa: multichannel PCM unsupported · Issue #1000 ...
https://github.com/raspberrypi/linux/issues/1000
Ideally the alsa driver would only allow 2 channels when analogue is enabled, but I suspect that may not be straightforward if you want more channels for HDMI. Yes, I've added a hack for it. If the user explicitly sets the ALSA controls to route audio to analogue, then the next ALSA stream opened will report only the stereo channel layout.
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