We had a C=128 which added a whole bunch of additional options that could be used in BASIC programs. While grade-school me was completely baffled by assembly (

We had a C=128 which added a whole bunch of additional options that could be used in BASIC programs. While grade-school me was completely baffled by assembly (wasn't in the manual that came with our used computer) it introduced me to the basics of sound synthesizers. You could define a wave pattern (square, sawtooth, triangle, ring, etc.), attack, decay, sustain, release, and pulse width with that version of BASIC and generate all sorts of sounds and music. I spent loads of time messing around with using variables for these different parameters to see how I could generate the coolest/most annoying sounds. Graphics were also a lot easier to play around with (it even had an interactive sprite editor built-in) but that's a whole other story.