The ones I have tried are:-
1. Rocktron MIDIMATE – OK, but TapTempo will not work with the Factor pedals due to lack of momentary switch config….it can only do latching for CC's
2. Ground Control Pro – very easy to program…there is a windows editor…never needed to use it as editing is very straight forward.
3. Fractal MFC-101 – Amazing controller, but is probably overkill, unless you are using an Axe-FX and also quite complicated compared to the Ground Control Pro( … Unless you are using an Axe-FX)