I'm struggling to figure out how to enter a new melody line with my Yamaha keyboard, BIAB 2013 and Mac Mini. I choose MacOS X CoreMidi and hit record, but I can hear my input only with the keyboard phones, and the rhythm track only with the Mac built-in speakers. Is there a better way? And I can't see any input until I'm asked if I want to keep the take; and I can't hear my line against the rhythm background w/o switching to the Apple DLS driver. I'm good with switching, but when I try to switch back to CoreMidi to record some more, it tells me CoreMidi can't be installed, so pick another driver. I have to reboot. Where have I gone wrong in all this (more than one place, I'm guessing)?