This post is very old and I recently received a reply regarding the power supplies. I use the original power supplies that came with the units most of the time. One of the power supplies is plugged directly into a three prong grounded AC outlet. The other one is powered games using the voodoo lab multi power supply. Is set for the correct milliamps, through the use of they’re custom cables. The units seem to react differently in different locations. I believe they should be stable? I believe there is a problem with both of these units but I never heard back from Eventide regarding a resolution. Both units are now a few years later.