Hi,
I have had a Rcktron MIDIMATE (didn't work with TapTempo due to the IA CC buttons being Latching)
I then got a Ground Control Pro and it works fine on the Ground Control Pro, you just have to set the Instant Access button to the MIDI CC Value and Channel of the Factor pedal you want to set the Tempo on (set the switch to be momentary)
the problem you describe is the Thru v Out issue, this is why the OP is using a MIDI Merge box (I assume) you have to merge the OUT and Thru ….. can get a bit of a "mind fry"
Just sold my GCP, so won't be able to test it out in future….went for a Fractal MFC-101 in a moment of beer buying!
