Vinnie Moscaritolo

Hello; I am developing a car-radio app in C++ (open source) for raspberry pi; https://github.com/vinthewrench/carradio I am having some success with the ALSA api and the Signstek USB DAC, but I would like some advice on how to solve a problem related to using 4 speakers. My code only know about left and right channels at the moment and does snd_pcm_writei calls to the “default” device. I believe I can just add another USB DAC to give me 4 channels (front and back) but I am unclear on how to write...