Start/stop don't pass MIDI-Through

[Darryl]

What I also do not understand, why it is sending out the clock at channel 4 (also all other events from the NDLR) as I am only using the drone for this example (hence the single note on command) and would have expected channel 3

Clock and Start/Stop/Continue message are global (System Real-Time) messages and not associated with a channel. You will have to ask the MIDI-Ox people why there's a channel on there.  It probably just shows the channel from the prior message because they don't clear it between messages. Despite its flaws, MIDI-Ox has been an indispensable tool for us.