I've now looked over the Focusrite products and I'm having trouble figuring out how many inputs and outputs I need. Currently I have midi output from BB/RB going to a Ketron SD2 via USB. The stereo audio output from the SD2 goes into the mic/line input on the PC. Then the stereo audio output mixed through BB/RB comes out of the PC through the earphone/line out jack which goes to my h-phones/monitors. If I want to add the ability to record and additional instrument/mic or two, how many inputs/outputs will I need and how will that be setup on a Focusrite?