Evan,

If you find them please let know since I've got the AVR-2700 and I'd like to know what they are as well. I've got an email in to UEIC asking them specifically about this receiver and if I hear back I'll let the group know. Are you using device code 0160 for the receiver? I don't think there are any discrete codes for the individual surround modes on the lower model Denon's. I know the 5700 has them but I don't believe there are any for the lower models. This is what I recall from some conversations regarding the Pronto at the Home Theater Forum.