Things you should check:
1-Find out on what channel your Mongoose is sending information. Factory setting is MIDI Channel 1, but double check.
2-Make sure your H9 is receiving on the same channel. In System Settings, [RCV CH] should be the same number as the Mongoose or “OMNI” if you don’t have any other MIDI capable pedals in your setup.
3-Make sure you’re connecting from the OUT of the Mongoose to the IN of the H9. It’s not uncommon to make this error.
4-Try another MIDI cable. There are no other settings you need to make on either pedal to get things working, so maybe you have a bad MIDI cable. It happens.
