Peavey 10 USB

[van]

I have the mixer PV(R) 10 USB, and is conected to the PC , I'm using the program "adobe audition". the mixer supose to record just the input's but I dont Know why his recording the beat from the computer... so his recording both the input's and the instrumental on the computer... if somebody know how to just record the inputs of the mixer... let me know please! I appreciate!