I´m using GTP4 and M-Audio Fast Track Pro as USB audio Interface.
I would like to use 4 outs simultaneously ( 1&2 as master and 3&4 to create a mix to headphones via SEND )
 
When I try to setup the audio driver in the Audio Option I can only choose one of the pairs (1&2 or 3&4) .
 
The manual of the audio USB Interface says that supports 4 out simultaneously.
 
Anybody knows if GTP4 supports 4 outs simultaneosly?
 
 
Thanks..

GTP4 only supports 2.