There is one unusual addition to the specification – MIDI on Swell. This was requested by the then organist, Alan Wilson, who is a noted composer and it allows a range of electronically produced sounds to be added as desired. Incidentally, this facility has been incorporated into the standard sample set, meaning that the Swell manual MIDI output from Hauptwerk can be switched on and off from within the sample set.
I would expect the midi in for the Swell to be send out on the same midi interface on which it was received when this stop is engaged. I would also expect the midi recording to record the stop on / off state.
(Although I have this excellent sample set I’m away from home at present, hence “expect”.)
Iain