Guys, up to now, I've just had no need for anything fancier than a basic 4-5 servo setup. So there wasn't much need to "read the manual." But it's good to try new things. The RDS8000 is an 8-channel Tx and I've always used it with the 8-ch Rx it comes bundled with. The only time I've used anything other than E, A, R, and T channels was when I set up aileron differential on one model.