VS10XX Dual Channel

Anyone (I may be looking at you Savitch) no a good way to get 2 sounds going at the same time on the VS10XX decoder? Perhaps a MIDI plus MP3 or interlaced WAVs?

Obviously this is for GameSlate. I’ve got the new POC board ready (battery powered, 4.3" LCD, RTC battery, battery charger, 6 buttons, joystick, RGB LED, thumbstick, audio jack and speaker 8)) and I’d love to have a couple of sounds going at once for the demo.