I just bought a 6100 and noticed that the remote control from my 3100 or 5100 receiver works with the 6100 through IR but the nice silver romote control (UHF Pro) from the 6100 only controls the 6100. The IR portion of the UHF Pro can control my TV and VCR but doesn't seem to want to emit a signal to control my 3100. I plugged a UHF antenna behind my 5100 and no luck. Is that UHF Pro remote supposed to only work that way or is my remote control defective? Anyone with similar experience?