Take 1 great singer, 3 great microphones (2 thru Neve channels & 1 thru a Harrison), bring each into Protools via its own aux strip, send them all out to a Quad 8 hardware compressor, then back into a record track. Once you've chosen a mic for each song or part simply mute the others and record. Takes a bit to set up but then it's really quick, versatile and gives you immense control. Jesse loved it, Mat at Coloursound Studios loved it, and I have always loved it. Try it; you might too?