I got my answer: When I press RotarySP, the following is sent:

on/Fast:
10:13:48.156 From MIDI SysEx Yamaha 9 bytes F0 43 10 4C 03 01 02 01 F7

off/Slow:
10:13:48.897 From MIDI SysEx Yamaha 9 bytes F0 43 10 4C 03 01 02 00 F7

Now if I can get my controller to send this MIDI string . . . ?
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Genos / Tyros5 / HK Lucas Nano 600 / FTB Maxx 40a / EV ZX1A / Rock'n'Roller cart / Hauptwerk virtual pipe organ / misc other audio & music toys