Thanks utz, that's very much appreciated. You may regret saying that though, ha, ha!
My hope is to use native programs and learn some assembly - particularly interested in the assembly side. I have picked up some 2nd hand machine code books but I've found little reference to sound and so am reading the "1 Bit Routine" tutorial with great interest (if little understanding at the moment!).
I spend toooooo much time as it is, editing/making music on a Mac, so I would ideally like to do as much as I can natively with the Speccy, rather than cross platform.
I am very interested in sound design and computer music in general and had been trying to get answers elsewhere about synthesis on the Speccy but with little luck. Finally found some irrlicht tracks, that led me to your videos on youtube and finally here.
I have my old ZX and an AY 8912 sound card (which literally arrived this morning).
Figured the beeper sound being output through the mini jack would make things a little easier.