Hello Joe,thanks for your responce.
The H90 is in Global Kill dry mode, the amps loop has a dry/wet balance but 100% is
still parallel! It’s not possible to make it serial.
There is a 50Hz noise when the H90 (in dual mode) is connected like this:
H 90 output1->Duotone H&K input
DuotoneH&K send->H90 input3
H90 output3->DuotoneH&K return
In the amps clean mode it’s not a problem.
In overdrive mode it’s a lot worse,
and in boost mode it’s almost unusable.
When I connect usb then it’s only usable in clean mode! I’ve made recordings off the noise.
But when I put the H90 only in the parallel loop there’s no 50Hz noise, and almost no usb noise, but then I can’t use Whammy, Octaver, Wah, Weedwacker…….