Can anyone help me with locking the settings for the auto play chords on a KN2400.

I like to play with apc set to advanced 2 but when I load songs etc. which I have downloaded (brilliant stuff) they will insist on resetting my keyboard to whatever.
Even when playing a song and pressing one of the panel memory buttons it can change the APC in mid tune.

I think I've tried all the sections from the manual but no success.

Thanks