Is it possible to use the Audio Injector Octo DAC board with Max2Play, and if so, is it possible to run Multisqueeze with 4 instances as the board can be configured to use 4 independent outputs?
According to their kickstarter, they use the default drivers for Raspberry, so it should work with Max2Play.
However, the breakdown of the channels is something we would either have to test on a card ourselves or you would have to inquire from the manufacturers.