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Eventide Staff

A few questions:

Describe your connections and signal flow. How do you have the H90 connected?
What H90 software are you using? Are you sure it’s the latest version?
Have you tried using the factory power supply?
Is it only on a specific Program or all of them?
Have you tried isolating the H90 by itself (ex. guitar >h90>amp) to see if the problem persists?