Looking to the TB universe for some advice: Currently running a very small pedalboard setup. TU-2 -> Homemade passive Volume/Mute -> Empress Multidrive -> Earthquaker Dipatch Master -> (soon to be adding a Darkglass Vintage Deluxe at the end as a pre-amp. I have been using the TU-2 to power the whole thing via daisy chain. I was playing this setup at my church yesterday and was dealing with a high pitched whistle when the passive volume was cranked, and it got even worse when the Dispatch master was engaged. The empress didn't effect it. Also experiencing major POP when engaging the Dispatch Master or mute. Before this comes up, I have tested the Homemade Volume/mute away from the pedalboard and had no problems. Could the TU-2 be the problem here? Is there another solution other than having to find room on my PT mini for a power supply? Thanks.