By best recommendation is to change the H90’s global routing to Dual mode. Dedicate path 1 to your PRE effect, the effect before the gain and cab sims. Dedicate path 2 to your post effect, the stuff after the amps.
Guitar > Input 1 > Preset A
Out 1 > Neuron and Iridium
Outs from Iridium > In 3&4 of H90 > Preset B
Outs 3&4 > to monitor/interface.
