I once found out on a BBC Master (which we borrowed from school) you can control the relay that controls the tape interface. A relay clicks on or off. So we had

I once found out on a BBC Master (which we borrowed from school) you can control the relay that controls the tape interface. A relay clicks on or off. So we had a BASIC program which clicked it at random, and it made a lovely clattering noise. Can't emulate that!