Created Issue: Does NAudio can play multiple music to multiple channels of sound card [16337]

I want to write a program to play music, exactly is play multiple music to multiple channels of sound card simultaneously.
Example in my PC have an internal sound card, and have an external M-audio fast track pro external sound card.
The M-audio fast track pro sound which has got 4in/4out.
How does the NAudio get the output channels name, and specified to play music to an available output channel of sound card?
Can i use NAudio to play music to mono output?