Korg Poly800/EX800 Users

hello polyfans.  great group by the way :)

So I've had my poly800 apart and couldnt find any obvious flaws regarding the non-working speed fader, I can input nots as normal, and the start/stop button works ok, but the sequencer speed runs very slow and erratic, if I enter a 4 note sequence the notes are played back non equidistant,  but when I sync it with cubase it runs fine matching the tempo nicely.
Do you guys think it might just be a broken slider pot?.  and are these pots easily sourced? or is there a replacement i could use?. 

any help here would be greatly appreciated. thanks fellas.

--- In korgpolyex@yahoogroups.com, "p" <peteput@...> wrote:
>
>  hey chaps.  i recently bought this poly-800 mk1 ( my 3rd!)  and it arrived with a non working SEQ Speed slider, sliding it up and down makes no difference to the seq speed. is this a common problem and is it fixable?
> 
> thanks
>