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Image Comments posted by TK.

  1. Note: it seems that this modification is only required for MIDI devices which don't comply to the MIDI specification!

    Usually the MIDI IN port of a device has to work correctly when the current through the MIDI wire is at least 5 mA.

    3.3V / (3 * 220 Ohm) = 5 mA

  2. No filing required - I only had to reduce the size of the middle boards with a cutter so that the second button row is between two boards (was done in 1 minute).

    Thats the reason for the small gap between second and third board row. But this gap doesn't hurt, the distance between buttons stays identical.