Ken, You mentioned that new 4ch Futaba. Will that let you adjust aileron differential with a y harness? The Futaba 6DA I have now (no computer) will only do that with Ch. 1 & Ch. 6 for the ailerons, not a y-harness into one channel.
Now before y'all get started, I'm currently using the 4 channel Tower radio that came with the Trainer & a buddy cord to the Futaba, but I do want a computer for the model memory, as I allready have a number of planes & not enough sense to stop accumulating more!

This 6DA is a pretty nice radio for not being a computer, it will do some mixing, dual rates, & flaperons, again requiring Ch.1 & 6 for the ailerons, & re-tracts, but no model memory[>:] Any suggestions for my next radio??
Mark
P.S. While I'm stilling learning to fly we don't mess with any of the features on the Futaba. He just trims it in conjuction with the Tower radio & off we go.