I'm aware of the many USB and Firewire interfaces to get audio inputs into the computer. Will they operate in the opposite direction simply for playback of BIAB? What I mean is this----can a USB unit be used to get the audio from the laptop, e.g. Forte synth, to the sound system for live work? I'd like to get away from those mini plug outputs that are fragile and always getting bumped, since they are placed in the very front of the laptop. USB seems a little stronger and are located on the sides and back. I'm sure this appears as a dumb question to the more experienced, but I really don't know how these things work.