I use that feature when playing live by programming my MIDI controller keyboard to be able to address BiaB MIDI Input at times when I want to use the MIDI harmonizer with the keyboard, but can hit one button to switch over to the "Voice" synth in the SD4 for the layered stuff. Using the USB connect frlom SD4 to the keyboard makes that rather simple to do. Of course, it can be done with MIDI cables as well. The only thing to remember is that when using the BB MIDI input, the only voices available would be those in the "MIDIFILE" sise of the SD4.


--Mac