my mate had an external MIDI interface thingie that plugged into the back of an Amiga 500 or 1200 :-o
we were so cool back in the day
I had one too, didn't get a midi keyboard until after getting an Amiga, then a few months later found I had arthritic hands. So my dreams of becoming a world famous musician were dashed...
...My inability to remember the music had nothing to do with this. Plenty of musicians have problems remembering the music and with most rappers you wish they'd forget entirely ^.^
Played Silent Service 2 for months. It was very nasty on the PC.