OK. I use the head with a Focusrite usb interface. So, I can adjust the sound level coming from the profiler head to get the good balance between the guitar sound and the signal coming from the computer. I don't know how to mange it using the USB audio function (that's what I do with the stage, no dedicated soundcard). When I try to adjust the levels for all the rigs (meaning not using the rig volume for each rig), both guitar and computer levels change.
So my question is how to balance the two signals, how to adjust them independently ?