No need to reinstall the OS. Only the 1024 sound patch (for all those banks).
What you do is hold the LFO Shape button down as the Virus boots. Next, send the 1024 update across, and the ABM.mid... that should be as good as gold.
There IS another reset procedure, which doesn't load anything on boot except the necessary things to recieve an OS update (doesn't even start the sound engine), but I can't remember it now.
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Anal Cam