mmm... I understand nothing!

But, If I monitor all the part from virus headphone out, why I have to send audio through usb port? usb must trasmit only midi, right?
So, If I play a key on the virus and listen it by his headphone out I have latency?
Maybe in the last moment, when I need to render the complete track I have to use usb for audio, right? why usb audio sound not good as analog audio? In theory if you use analog you have to do dual conversion, with the usb all remain in digital domain, right?
thanks for your time