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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 ...
AlsaProject
https://www.alsa-project.org/main/index.php/Main_Page
The Advanced Linux Sound Architecture (ALSA) provides audio and MIDI functionality to the Linux operating system. ALSA has the following significant features: Efficient support for all types of audio interfaces, from consumer sound cards to professional multichannel audio interfaces. Fully modularized sound drivers.
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