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Oops, I see that it is called module in stead of expander. (title edited)
Well, it is not my wisdom, I found this years ago on the internet.

Here some links:
http://www.compuzik.de/DB50XG.html in German
http://m1n1.de/html/body_midi_expander.html
http://atari.nvg.org/db50xg/

I have built something like the schematic in the last link with 2 extra inverting buffers to get a better wave-shape of the midi signal to the DB50XG.

I like the QXGEDIT program because I can use it on the Raspberry Pi, not yet the latest version though.
Is is probably possible to ad the midi through function as a feature to QXGEDIT? In this way it is possible to listen to the edited sound wile editing.

Thanks,
Jan