PC Speaker To Eleven
The most amazing thing I've heard done with a PC speaker is in the last part of this equally amazing demo (starts at 6:37 --- the parts before have more "normal" beeper music): https://www.youtube.com/watch?v=yHXx3orN35YExplanation here:
https://www.reenigne.org/blog/8088-pc-speaker-mod-player-how...