Thanks for all the great input on this thread. I bought a 15-1994 today. I'm new at this and alittle overwelmed. Just trying to get the basics down first. I have two devises for which I can't find the mfr code; McIntosh MSD4 SSP and Sonic Frontiers L-1 preamp. I'd like to set them up as Aux1 and Aux2. Can anyone help? Thanks in advance.