by ACX » 26 Sep 2014, 17:25
Hi elcampesino,
we set up the system with best audio quality in mind, so MPD currently has exclusive access to the ALSA sound layer. This means that no mixing process is possible at this time - to do that we would need Pulseaudio (not the best choice for bit perfect playback) or JACK (that could be a valid option). I'm sorry but such feature could see daylight only in a more advanced stage of development.