Emax

Hello everyone..

My emax seems to have a *slightly* different filter setting every eighth key played. When 
there is no filter applied it sounds as it should but when it's on or adjusted to a low setting 
it's very noticeable. I can live with this I guess but it worries me that there might be a deeper 
issue which can quickly turn into a costly repair. It's also a little annoying due to it sounding 
like a reversed note at times.

Might anyone know the cause or have a solution for a fix?

Thanks in advance!