That is some difference!

It definately seems to be the case that there is a bug in the channel lock code whereby the channels aren't identical. This problem is compounded by another (bug?) where the player forgets the channel lock mode at powerdown.

Do you want to enter a bug report, and email the empeg guys..You found it first. You can reference this thread as it has some good info in it.

Thanks for doing that second graph for me.