[LAU] Four outs with M-Audio Fast Track Pro USB

Hello. I've been using the M-audio fast track pro USB audio interface for about a month and I have had a very good experience using it, it worked out of the box, it's very easy to configure to do basic operation. But now I want more, I want at least to be able to use the four outs of this interface. All four outs are recognized by linux, but they are recognized as different output devices, and I don't know how to work with both devices at the same time. I specially would like to make both devices appear as output devices in JACK. If anyone can help me it would be very much appreciated, this audio interface seems like a very good option to work audio in linux, especially as it is very portable. Thank you very much.