Thanks for the opportunity to beta test the Channel Extender Kit. I'd like to let prospective buyers know about a "hack" of sorts I discovered. By chaining two Channel Extenders together, you can actually unlock channels 5 & 6 on many radios. This requires the purchase of two kits. First, run a single kit as in the manual, to unlock ch3 & ch4. Then connect the two kits together, using both transmitter programming adapters in series to set the correct connections. Leave the first block as it was, but on the second, straight-wire all jumpers ("model 9999 - reserved" in the manual). I've tried this on three different controllers and it works perfectly! Unfortunately I have not been successful at unlocking anything above 6ch, but I'll keep tinkering. Thanks for the great product.