My MT32 Clumsy MIDI Program Changer and Filter was a little disappointing, in that it didn’t seem to be able to keep up with the MIDI stream fo

MT32 Clumsy MIDI Simple MIDI Filter

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2021-05-12 02:21:32

My MT32 Clumsy MIDI Program Changer and Filter was a little disappointing, in that it didn’t seem to be able to keep up with the MIDI stream for my Lo-Fi Orchestra, so I thought I’d try for a simpler version using the 5V/16MHz Arduino Pro Mini without the extras for selecting the MT32Pi voice to use.

Warning! I strongly recommend using old or second hand equipment for your experiments. I am not responsible for any damage to expensive instruments!

This is a very similar circuit to the MT32 Clumsy MIDI Program Changer and Filter using similar principles, but it is greatly simplified by:

I recommend thoroughly testing the board before connecting it to the Clumsy MIDI and then test it again before connecting it to a Raspberry Pi.

If an external (5V) serial signal is to be used, then the jumper should be completely removed and the external signal connected to the two outer pins, with nothing connected to the middle one, as follows:

This is using the same code as the Arduino MIDI Filter – Revisited to keep things simple. Programming the Arduino should be slightly simpler than last time, as everything is 5V – just remember to disable the RX/TX link.