Thank you Paul. You're a star.
Been talking to my son, who's in avionics, and we feel between us all we can sort it 
I will order the parts talked about next week.
Recording, editing and labelling wav files is a doddle - phew!
I've been looking for a simplistic programming environment to get me started. Do you have any suggestions?
Thanks again
BTW
This is what I drew up...
KENs Control outline.pdf (408 KB)