We've developed a multichannel audio system based on the AD1938 audio codec by Analog Devices and the BeagleBone Green (TI AM335X SoC).
The audio system offers 2 stereo inputs and 4 stereo outputs.
The whole project is based on open source software.
To demonstrate the possibilities of the audio system, I've created a surround delay effect with the open source C++ library DSPatch by Marcus Tomlinson.
Moreover I've created an automatic test based on GNU octave to evaluate the audio system characteristis, such as latency, THD+N, DNR, crosstalk and frequency-response.
The full article is published here.
Everybody who's interested and has some questions or feedback, feel free to contact me.
Cool project, I look forward to the day when I am using an "audio appliance" and not a social media / streaming media computer to make music.
And, to state what's probably obvious to most people here, your 2-in 4-out low-latency system could be used to build a DIY 4x2 pressure sensitive surface. I'm sure the AM335x has sufficient power to calculate 2,000 multi-point FFT conversions per second.