Hey Daniel, Yep sending stereo out from the PlayAcoustic to your speakers will be possible. You just set the output mode in PlayAcoustic's setup menu to "Stereo" and the two XLR outputs will be your left and right that you'd send to the speakers.
The PlayAcoustic doesn't come with a physical manual, but you can find the manual on our site here.
The MP-76 mic and Switch-3 footswitch have similar but different possible target functions...
Here's what the MP-76 can control in PlayAcoustic: -Preset down -Preset up -Hit -Hit & Talk -Hit & Tap -Loop play/record -Loop stop/clear -Loop undo -Tap tempo -uMod -Delay -Delay momentary -Reverb -Harmony -Harmony momentary -Doubling -Transducer -Hardtune
Here's what the Switch-3 can control in PlayAcoustic: -Loop rec/play -Loop stop/erase -Loop undo -Loop start/stop -1 button looper -Tap tempo -Harmony -Harmony momentary -Delay -Delay momentary -uMod -Transducer -Hardtune -Doubling -Reverb -Guitar boost -Guitar uMod -Guitar delay -Guitar reverb -Guitar phase -Set key -Hit -Preset down -Preset up