Hi, I have a behringer xenyx ufx1204 mixer connected via usb to a lenove laptop running audacity 3.7.8 and while I can select one of the mixer input devices and record audio and hear what I am recording via the mixer main output, when I try to play back the recording using one of the mixer outputs (I have tried both main 1/2 and alt 3/4) I get nothing. I only get audio when using the laptop speakers. is there anything obvious that I am missing? much appreciated