Hey All!
I made a little video showing how I used the custom rhythm tracks on the EHX 22500 to sync the tempo with external gear (in this case my Modal Skulpt) Hopefully this can inspire the engineers at EHX to add a sync inn functionality to the foot-switch input.

You can find the rhythm tracks I made as well as written instructions here:
https://drive.google.com/drive/folders/1W_N-PHeUqihHv7QsUUe-1nPEond2eNjy?usp=sharing

Hope this is helpful!
Cheers!