Playing music from an ipad through QC

Hi. I am using Moises to play backing tracks from an ipad. I have a USB B to USB Connector from the ipad to the QC. The ipad recognises the QC in the ipad speaker output. On the QCin IO settings for the USB I can see the level meter showing an input - so far so good…… BUT, I simply cannot get the music to sound from my FRFR speaker. I have a mono line out from the QC to the speaker and I can hear my guitar fine - but not music plays. I cannot see a way to map the USB input to an output channel.
Anyone throw any light on this -I am clearly missing something.
Thanks