Your MIDI keyboard should now be successfully interfaced with your computer, potentially via your audio interface. This hurdle cleared, you are now unfortunately through the looking glass – and may be ...

That’s it on the left, next to a standard MIDI cable plug. The whole thing is so small it fits inside a MIDI plug and can run off the power supplied by the MIDI output, driving a small pizeo buzzer.

Fitting into a cubic inch of space, the tiny instrument’s volume is mostly taken up by the MIDI connector itself which was perhaps an acceptable size by 1980s standards but seems rather bulky today.