Hmmm......if the line signal indicators remain green after the virus sound has decayed, this may be due to the fact that there is still some signal present, even though you may not be able to actually hear it, if it is extremely low frequency???
The +4/-10 thing has nothing to do with your gain, but more with the voltage that your inputs accept. Most professional gear runs at +4dBu, and in the old days, semi-professional gear ran at -10dBV (or -20dBV for instrument level). Nowadays, project studio gear is designed in some cases to accept both +4dBu AND -10dBV, so for instance, my Mackie mixer has a button that allows you to choose between +4 and-10 on the stereo line inputs.
Im not very familiar with your mixer, is it an old one? it may just need cleaning or something??? or may be noisy. Do you have any other synth to check if the same thing happens.......cos then we can find out for sure if this is a problem with the virus, or your mixer.
Keep trouble shooting, and narrowing down the suspect.
Good luck,
Jase
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