In the new 1.07 firmware, there appears to be the possibility that you can pass the MIDI Clock input DIN to MIDI Out DIN, but I'm not sure its working?
((Option 14 and 16 are not working as expected))
3.4 MIDI I/O Global
PGM 1 = MIDI In OFF
PGM 2 = MIDI In DIN only
PGM 3 = MIDI In USB only
PGM 4 = MIDI In DIN + USB
PGM 5 = MIDI Out Off
PGM 6 = MIDI Out DIN Only
PGM 7 = MIDI Out USB Only
PGM 8 = MIDI Out DIN + USB
PGM 9 = USB MIDI Merge Off
PGM 10 = USB In to DIN Out only
PGM 11 = USB to USB only
PGM 12 = USB In to DIN out + USB
PGM 13 = DIN MIDI Merge Off
PGM 14 = DIN In to DIN Out only
PGM 15 = DIN In to USB only
PGM 16 = DIN In to DIN Out + USB
It seems like 16 should effectively echo MIDI Clock input to MIDI Out, as if it were a MIDI Thru?
If not, I'm going to make this a Feature Request; otherwise Messenger has to be end of MIDI Chain.