I used to love listening to mods and demos on my Amiga. One of my school projects was making an adjustable 2 channel mixer out of a couple of op-amps and a handful of resistors and a 2 pot variable resistor (plus power), even etched the PCB myself. This allowed me to mix the sound output from my A1200 to give a better stereo effect (rather than sound coming out of either the left or right), which made listening on Hi-Fi separates (my dad gave me his old broken Rotel amp which turned out to only need new internal fuse replacing to work ) much easier on the ears.