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I owned a C-64 but I was real young and more into games and the like. I keep hearing and seeing ppl. go head over heals about this chip but I never quite understood why it was so great. I had a disk of SID music way back then so I know it plays music and stuff, but it only reminded me of .MOD music...
That's not entirely true; while they were recorded and mixed together (one SID model in the left channel and another in the right) the echo effect is done programmatically entirely on the C64. The third voice oscillator is read by in a fast interrupt and fed back a few hundred samples later into the master volume register of the SID (which is a a common trick to play 4-bit samples on the C64).
