Yes I get exactly the same running from shared power supply (a pedaltrain volto rechargeable supply). The B9 causes the hum/whistle when plugged in even if the in/out jack leads are completely removed from the chain. It’s the only pedal I have that does this which is a pain as I moved to the Volto so that I didn’t have to have a mains cable trapped across the stage. Anyone suggest a mod to the power cable that would fix it?