USB/VC buzzing on Snow

[MarkM13]

This has just started. I'm getting a really annoying buzzing sound when using Virus Control. If I'm just using the MIDI ports, the Snow is silent; which tells me it's not a grounding issue. It's only when I add VC to a project.

Any thoughts on how to make it stop??!! This just started, VC was quiet up util yesterday.

Thanks,
M