Thanks rharv. That did it. I used the USB cable it came with.
Strange that the manual doesn’t indicate that the USB port, which is on the back panel with the “out” ports, is the necessary input. Directions were sadly lacking.
The only problem is I have the turn the volume way up on the Surface Pro and the QSC speaker.
I’m not sure it'll be loud enough for gigs.


Cheers! -Alastair