To use Separate App Sound on a Samsung Galaxy phone, go to Settings > Sounds and Vibration > Separate App Sound, toggle it on, choose the app (e.g., Spotify), and select the audio device (e.g., ...
I have a 7.1 USB sound card from Startech with 3 discrete 2ch outputs. It's a Startech ICUSBAUDIO7D. It uses a C-Media CM6206 chipset. I have kind of a weird intended use case for it and I don't know ...