Disfunctional soundmode K80895

Concerning K8095 Mp3 player:
Malfunctioning soundmodebutton. Two of the optional soundmodes is not working or give a bad soundquality/dissonans.
Possible cause ? Malfunctional Mp3 Decoder or IC ? Bad soldering?

TOmas

Which are the two modes that are not working OK?

If you using the MONO setting (SK1 jumper cap set), the DISCO and the HALL effects doesn’t give the space effect.
These modes need to have the stereo mode on and you have to use stereo speakers or stereo headphones.