[zero_iq]

The last time I coded something along these lines was way back in the day for pulsing the Amiga's power/disk drive LEDs in time to music and sound effects, instead of their usual on/off/half brightness states. Not quite so useful, but I remember having fun coding it :D I was surprised at just how effective it was, without any noticeable flicker.

[snvzz]

Hopefully not the power led, as the audio filter is switched with the same signal.

Some early games made that mistake. It sounds horrible in anything newer than the first A1000s.