most of the patches work fine
but some of them are wacked out and sound horrible. like digital noise and stuff. i did full diagnostics by holding down the cursor keys and powering on the unit and all tests passed except the midi test. it just said

midi test FAILED!

any idea what to do from here? i have used midi-ox to clear out the sounds and dump the sisex data and also removed the battery and placed it back in.

any help is appreciated!
ps i can solder and have basic knowledge of electronics