Saving whole banks to A or B works well. Copy the best patches from A over the worst ones in B, then transfer the edited "good" bank to ROM. From there you can import more fresh banks and start again.
But....
If you want to run through each sound in a bank and just save the good ones (from your normal sequencer)....
You have to set the Virus to "force to edit buffer" - load the bank into your sequencer - set the sequencer to a really slow tempo - press play, and after the patch name pops up on the VC screen, press pause on your sequencer - play the sound - if you like it, save it - if you don't, press play again and get the next patch in the bank. Time consuming, but this lets you go through the whole bank without overwritting any patches on A or B.
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