these are the correct caps.
keep in mind the ansible draws all power from the 12v line, re trogtronic.
i'm sorry that there is so much trouble when it comes to matching a power supply with these modules.
one solution to check is to ground-lift the ACDC power brick for your power supply-- often the noise is ground related if you're connecting to a grounded mixer or set of speakers.
another solution is to offload the USB power using either a Switch, ext5v-- both of which we're out of-- i'm sorting out a new/better solution. one of which is this thing:
(edit: removed link prior to testing)
basically it provides external power to two devices. external power comes from a usb power source as well, so no voltage issues-- and you can use an iphone-style charger which are ubiquitous. this thing isn't mountable, it's just a dongle. we can design some mountable versions or different configurations quite easily. also this one doesn't switch. it's just power isolation for two devices, ie grid+arc