We¡¯re all in the same boat. ?Trying to be Crestron installers and programmers when they don¡¯t seem to be making any headway after several years of essentially not shipping anything useful. ?We¡¯ve been doing MC3 and RMC3 and buying them from Ebay. ?A better solution then running lighting on a VC4. ?Those two processors are still available without the silly ¡°supply and demand¡± overcharges the CP3 and AV3/PRO3 is getting. ?As far as lighting is concerned, is there any functional difference between RMC3 and RMC4?