So it begins!

A Science Fair Microcomputer Trainer, running a pseudo-random note generator, picking notes from a minor scale:

 
Two Science Fair Microcomputer Trainers, both running a pseudo-random note generator, picking notes from a minor scale:

 
Two Science Fair Microcomputer Trainers, one running a pseudo-random note generator, the other keypad triggered pulse tone synthesis (my favourite so far):

 
Two Science Fair Microcomputer Trainers, both running a pulse width modulation program:

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