sorry i don't really understand this...
are you saying you are trying to use the physical midi in on the virus to control the virus while its in VC mode?
if so, i can confirm that doesn't work, in fact it doesn't work if you have the USB plugged in at all... physical midi is 'disables' when USB is connected.
actually this is 'incorrect'... when the USB is connected the midi ports become extensions of the USB interface, the virus becomes a midi interface
i.e. Virus MIDI becomes active, this means you can send midi messages to devices connected to the Virus
(I don't like this either, but this is what it is)
Ive done a lot of testing with the virus and midi, over both usb and physical - and the performance of the ubs interface is much better than the physical,
I think this is purely down to data rates support on midi cables.
and I really don't think the sound is any different, the only difference i hear is using the analogue outs vs digital... not what you use as a control source.
(of course if your usb is jittery then yes I can imagine it would make a difference)
I'm awere that physical midi doesn't work with VC. I'm just hoping that someday access develops plugin that behaves as VC with physical midi. I have made lots of testing too, somehow the usb is not good in my case. I tested even usb to midi cabel, and the result remains the same. When you look at the recorded wave, with physical midi, there is more dynamics in the sound. My usb routing is top notch, so there is nothing to improve that.