VL Pedal Power 3 Plus user here. Is there not simply a single cable that will connect the PP3P to the H90? Would this one work, attached to the 12v 500mA outlet?.. https://voodoolab.com/product-category/cables/reverse2-5/
I’m also using the Pedal Power 3 and asked Voodoolab about it. They suggested to use one of the 12V X-Link (1A) outputs with a reverse polarity 2.1mm/2.5mm cable. Works like a charm!
This is the cable you need: