I don't think it has anything to do with being a *Dell*
I have a Dell Dimension XPS R350 and I have made two Tx's work, (Futaba FP-T6NL's) one with the *2 transistor* interface, and the other by throwing away the electronics and changing the pots to 500k.
(That is NOT a task for the faint hearted!)
That is the one I now use as I can use it for everything I would normally use a joystick for, such as Combat FS
It may be necessary to set your Tx up from within FMS *as well as* from your computer's control panel.
In case it helps, I advised somebody else to :
Set your channels 5 -8 to the same numbers as the first 4.
For instance, I have mine set to:
Rudder 4
Elevator 2
(Right stick)
Aileron 1
Throttle 3
(Left stick)
(These are AIRCRAFT settings)
Tail 4
Nick 2
(Right stick)
Roll 1
Pitch 3
(Left stick)
(These are HELICOPTER settings)
Note that only the first 4 blue columns actually move up and down when calibrating. Don't worry about it!
Ticking exp (exponential) can help a LOT with helicopter flying <g>
HTH
RR