IF you can send it to the mains, run a cable from the mains 1/4 jack back to an unused channel input. Set the monitor level on that channel to send the mains back out to the monitor so that anything on the mains from USB will be in the monitors... This is hokey and you have to disable this channel by not sending it to the mains, from the mains lest the thing will oscillate.
As versatile as this Behringer stuff is, I rather doubt that the USB can be routed directely by setting to the monitors... But just ry to find documentation about this!
Typical of this brand, finding and understanding the documentation can be frustrating.
Answers & Comments
I suspect that you don't, at least easily.
Try this:
IF you can send it to the mains, run a cable from the mains 1/4 jack back to an unused channel input. Set the monitor level on that channel to send the mains back out to the monitor so that anything on the mains from USB will be in the monitors... This is hokey and you have to disable this channel by not sending it to the mains, from the mains lest the thing will oscillate.
As versatile as this Behringer stuff is, I rather doubt that the USB can be routed directely by setting to the monitors... But just ry to find documentation about this!
Typical of this brand, finding and understanding the documentation can be frustrating.