How to control USB Audio Mix with Guitar

[gfiehler]

I am trying to play along with some songs from my computer but cannot find a good way to control the mix on the Axe Fx, I can change volume on the computer but was hoping to play with the mix of the guitar and usb audio in in one place. I tried a couple of searches for this topic but was unable to find anything.

Thanks in advance

 

[Badcard]

In this situation, I usually adjust the playback volume of the play along track through the player on my computer in relation to the guitar sound.
The general level is set through the volume of the Axe has I'm monitoring the whole thing through the headphone out.

 

[Alex@home]

I encountered this tonight too.

Output 1 to my monitors
Output 2 to my power amp and PA cabinets

Computer connected by USB - The Audio backing track played on the PC only comes out of my monitors on output 1.

I want the Computers audio to come out of both outputs 1 and 2 ??????