Thanks guys, DScreams and GRS are right in that the pots are bent. I emailed Access who in turn referred me to their hardware depot, who let me know the pots would need replacing to solve the prob.
They emailed pics regards what to do, with a disclaimer saying a service person should carry it out, but I'll dive into it anyway.
Just need to grab said variety of pot (not the intoxicating kind), and a decent soldering iron as the one I've got is crud...
I'll post pics as/when I'll get around to doing it.
### UPDATE: I HAVE SINCE RE-POTTED THE KNOBS ON THE VIRUS. - YOU CAN FIND A FULL POTTING MASTERCLASS COMPLETE WITH PICTURES: http://infekted.org/virus/showthread.php?t=31443 ###