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I have two SPH9’s and have used them with both the H9 and H90. They are rock solid and the expression pedal portion works perfectly with both the H9 and H90. But the footswitch portion does NOT work with the H90. I’m 99% sure this is by design … the H90 doesn’t support exp ped and footswitch functionality (with any pedal) like the H9 did. I can confidently recommend the SPH9 for exp pedal functionality for the H90 after using them together for many months.

Good luck!