Amp Out & no Aux or USB forwarding

[pegasus1304]

Hi,

 

I have plugged studio monitors into main outs. A Headrush is in Amp out and does work for the guitar signal.

 

However if I play along with either USB or Aux in (Loop return), the aux signal is only going to MAIN outs.

 

Any setting to change in order to get it on any of the speakers?

 

Cheers