Hi Skirmash,
I also have all the problems you have ever heard of the KN6000 as I have bought it. With every update the problems grow down.

One of my major problems was the chord-problem. This was solved with version 3.0.

Now I have installed the latest firmware (Ver. 5.0) last week and I will downgrade it to version 4.0. Cause I have seen problems in Version 5.0 which I did not have with version 5.0. One problem is that the Technicord sometimes holds a note and you only can "cancel" this note by switching off and on the keyboard. One other thing is that (do not ask me why) that you can hear much more "noise" from the speakers.

I also have recorded a CD with the sequencer and itīs a hit of each party.
Basicly: the KN6000 is a very good keyboard and I like it to play.

regards
Herbert