I have now found the source my strange sounding sounds. It had nothing to do with the sound load option, they were all on with all my styles.
When going through all styles and belonging styles I found a certian PM that initiatet the problem. The I selected other sounds with this PM as "base" all sounds had some strange chorus and the would keep going even if I loaded other styles. When turning off and on the keyboard the sounds were back to normal until "hitting" this certian PM.

The solution was simpel just select another PM and store this to the faulty one and resave the style to the HD.