Soundtrakker is a great music program for those who are musically talented. But not everyone's a genius with a piano, are they? Wouldn't it be a lot easier if you could just sample somebody else's hard work and loop that?
I'm going to surprise you now. You can. Out of the many sound digitising programs that have appeared on the CPC, DigitEditor is by far and away the best. When loaded, the main screen gives you the choice of no less than five sub-menus. Throughout these is a library of options allowing sound to be played back at a variety of speeds and volumes, even backwards (you really should hear the subliminal messages on Rolf Harris' version of Stairway To Heaven, you'll never see Australia's finest TV funnyman in the same light again...).
What's more, a massive 16 seconds of sound can be crammed inside the memory limiting the program only by your imagination. Nearly.
Unfortunately, owing to the CPC being only a humble machine, it does have a few limitations. For example, it would be unfair to expect the poor chips to handle Iron Maiden at full blast; the sound quality is a little crackly even with Nick Berry (er, so I've been told...).
For the demo-coder looking for a smart little talky-bit, DigitEditor really is the top dog, but to my knowledge, there are no music programs that allow digitised sound to be incorporated into a tune. Sorry.