Originally Posted by Jope
Midi was popular on the PC, because it offloaded the processing and mixing to the sound card. The early PCs didn't have too much horsepower to mix the samples with the CPU. That's the reason most old DOS demos want a Gravis Ultrasound, they didn't have CPU cycles available for mixing the MOD channels to stereo, and the Ultrasound was the only card back then that had also sample mixing in hardware.
Funny to think that PC's stuck to MIDI even up to the days of the 486/Pentium, while the Amiga with it's 8Mhz CPU did all it's music with samples from the outset. Just goes to show how right the design was.