Unfortunately the MIDI Solutions part you linked to needs power over MIDI, which as mentioned, is not usually supported by the H9. You can modify the H9 for this, but it involves soldering.
I personally wish that we had given the H9 separate switch and pedal jacks, but I guess there was no space. As a result, if you don’t use MIDI, you are limited to either 3 switches, or one pedal and one switch.
Thanks for the reply! Yes, it would have been nice to get a jack for each the AUX & Expression, but I think I can make it work. I added the PolyTune back on my board for a 1-click tuner/killswitch, and hopefully navigating the presets/tempo won’t be too tough. It is nice that you can press the wheel to reverse your bank navigation.
Can you confirm that this pedal would work for the VP Jr. 25k http://www.midisolutions.com/prodfsw.htm
And also, more importantly, can you comment on the MIDI Lag here — is this a real issue? https://www.eventideaudio.com/community/forum/stompboxes/h9-expression-pedal-over-midi
