I purchased a 2nd transmitter with the intention of having them both plugged into the two guitars I gig with, and the receiver base on my pedal board. Currently, I unplug the transmitter from one guitar and plug it into the other. I wanted to avoid this step and just switch guitars. I just tried it now, pairing each transmitter in the base. I could not get them to work together. The one that was paired last, works when plugged into the guitar, but when I plug the other one in, it does not "talk" to the base. If I put that one into the base, it will work but not the first one. MusicLaw, you mentioned that you did get this to work for you...was there some procedure you did to activate this, or am I missing something? I would love to know before I take it back to the store. Thanks! J.