I have no experience with a keyboardy Virus but there are 2 buttons you can press simultaneously to force the Virus to 'play' the current sound.
Testing this should eliminate any keyboard issues and prove your sound output is working.
You may also be able to play a demo song by pressing another 2 buttons...
Also see the little screen - when it receives a MIDI note to play (MIDI VEL ON), a musical note picture appears.
If this is filled in (crotchet) then the Virus has received a MIDI note on the right channel.
If this is NOT filled in (minim) then the Virus has received a MIDI note - but on a channel it is not responding to.
A few things to try.
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