Can I join in here....
It may be some help - I've only had my KN7000 for a few weeks but noticed precisely the same thing at the start when saving settings to the panel memories and then when subsequently attempting to use them which I knew would be absolutely no good for public performance....so I read a bit more in the operating tome....and discovered this...
When saving settings to panel memory the APC/Sequencer volume must always be FULL ON.
If you need to alter the volume level downwards during play that's fine but then and only then to you have total control over the volume level as you change from panel memory to panel memory.
So far during play I have never had to alter the volume balance between left hand and right hand and have not touched the APC/Sequencer volume at all since setting it to full on.
Good luck
Roger M