I must say I'm sometimes afraid of touching the chassis of my Virus.
I once had a defective power supply, that made my fuses blow immediately when I plugged a MIDI cable into the Virus.
(the other end of the MIDI cable was already connected to my PC soundcard, which is of course grounded)
If I plugged the MIDI cable first, then the power supply, it went fine ... for a few hours. Then, my fuses would eventually blow.
The store where I bought the Virus got me a replacement power supply for free, and now it's working fine.
Except that I sometimes feel some electricity in my fingers when I'm plugging the power supply (if I touch the Virus and the metallic part of the power supply connector).
I have the feeling that in some ways, plugging a MIDI cable grounds the synth. AFAIK the MIDI connections are supposed not to electrically connect devices, but maybe it does not stand for shielding?