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> Try connecting the MIDI out of the AN1x to the MIDI in of the 707.
> If you still don't hear anything, you have a problem.

Allright, i think i have a problem then... :)
connected the an1x midi-out to the tr-707's midi-in,
set midichannel of the tr-707 to 10, set an1x Tx Ch to 10,
result: - no sound when i hit any of the an1x's keys. : ---- (