Seems to me that there is a problem with the unit when it’s in dual mode and in the parallel loop of a distorted tube amp….. Or am I doing something wrong?
Can you describe the problem or are you still referring to noise when using USB?
When using H90 in any amp with a parallel loop, the H90 needs to be used in Kill Dry mode to avoid any type of comb-filtering. If the amps effects loop has a dry/wet balance control, it’s preferred to make it function as a serial loop by setting to 100% wet. Then, you’ll be able to use the H90 without Kill Dry on.