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I remember having the 1541 disk drive for my C64 play tunes.

I remember this too, it was real, but it also apparently could damage the drive lol

You’re right, this was used to great effect in Castle Wolfenstein - where the guards would shout “Achtung” in German.

If you accessed (either read or write) memory address $c030 it would move the cone of the speaker in or out. Do it fast and you can create tones and voices.

I remember a demo at my Commodore 64 users group one day...a guy loaded a bunch of stuff from a disk and output (with sound quality not that much worse than a car's crappy AM radio speaker) the first 10 or 15 seconds of "Kung Foo Fighting." Of course, the C64 had the VIC chip, but it was still freaking impressive.