I also got West Pest for christmas from my wife. Tried sequencing it from the OT, got the same issue reported above - each MIDI note activated the gate on both NoteOn and NoteOff signals.
Good news: updating the firmware to 0.9 fixed it, the problem is gone.
Semi-Bad news: The lowest MIDI note OT can send (C-1) is still actually C2 (65.5 Hz), so if you wanna play bass notes, use the transpose trick from above.