Congrats on getting the H90. You will love it!
I’ve been using a Roland EV-5 expression pedal for over 15 years & so can highly recommend it.
If you haven’t already done, so, check out the excellent Eventide video series (3, in total), The second (link below) of which goes into solid detail on the use of expression pedals.
https://youtu.be/tfd3wQHzxcA?si=G8YaTazEtkTZkB68
Enjoy your new H90!
-T
