I wish that the Moog One had MIDI Local modes on/off in order to use it as a master keyboard for other synths. Did i overlook that? Is this planned?
To suppress sound generation, turn out the "On" light in "Keyboard Control" for each of the three synths. For the MIDI events to be sent out, though, you have to go into Settings | MIDI I/O. Set the appropriate MIDI OUT PORTS. For me, setting MIDI OUT PORTS to "DIN & USB", MIDI OUT ROUTE to "ALL SYNTHS" and MIDI OUT CHANNEL ALL to "1" sent my keyboard signal. The only change I had to make (beside turning sound generation off) was to change MIDI OUT CHANNEL ALL from its default "OFF" to "1".
EDIT: I'm running 1.0.3 OS.