Thanks for your replies!
Unfortunately I don't have any way of testing as all of my gear is Eurorack rather than MIDI.
But you're right, there's a green light on M32 that flashes when it receives MIDI messages and it's not flashing or anything.
Does the MIDI clock play automatically on H9 or is there some kind of play signal you need to give it?
Thanks folks 🙂
You need to set the MIDI OUTPUT to "XMT" or "MERGE", and turn on CLK.OUT. Last but not least, you need to turn on the tempo mode of the current running algorithm. You can easily do this in H9 Control, or simultaneously press the right footswitch and the PRESETS button.