Bob, I'll re-open the keyboard casing and reconnect the pitch bend wheel, although I don't think it will do anything. When the pitch bend wheel was connected, none of the sounds would correspond to it accordingly.

I just tried setting the split point to the bottom C (C1) and I kept the APC setting at fingered but there is a rhythm. In fact, you can even play chords up until the bottom E. So I'm wondering why there is a rhythm despite doing all you said.

I think I just need a new main board. I don't know where to find one for the KN 7000. A friend of mine in the UK says Panasonic still repairs and replaces and the main boards, but it would cost me a lot to send the board there and have it replaced and shipped back.