I have an old (you guessed it) Yamaha EM-150. Born sometime in the 70's. I've used it for a simple vocal PA in a small band practice setting and also as AUX output for iPods, etc. I've stepped up from a USB mic that was going straight into the computer for recording - to a Roland Duo-Capture EX audio interface today. I'm having a tough time figuring out how to hook up the two so I can use the output of the Roland device instead of the computer sound card. The Yamaha has speaker jacks, monitor out, record out and AUX jacks along with echo jacks. Is any of this usable or would it be better to just get some powered monitors and save the PA/Mixer for live stuff?