Mike has debounce software in there, and it does work reasonably well. My knob has also got worse and worse over time. The shaft has become quite sloppy in the housing and you can change its behaviour by adding a little sideways pressure to the knob/shaft (I have a mk 2, not a 2a). I have an originaly replacement pot., but I am considering fitting a mk 2a unit as the quality is supposed to be much better. The only problem there is that the original is surface mount and the mk 2a unit is thru hole. In my case software is no use at all, it is definitely a hardware problem, and I think some of you may be starting to see the same problem too.

Cheers
Derek