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Eventide Staff

It is powered on my board with the Fender Engine Room Lvl 8 on 12v with a reverse polarity cable,

Are you using two outlets to power the H90? On the Fender Engine Room, one outlet at 12V only provides 375 mA of current severely under-powering the pedal. Ideally, you want to combine the output of two outlets with a current doubling cable. This would work with two 9V outlets as well.