Yes, the plugs are loose fit in the jacks on my KP-200S also. Doesn't seem to cause a problem, though.

I wonder how much of a "sterio" signal the Millenium module sends? You would think that if sterio enhanced the sound, it would come with 2 audio cables instead of just one.

I would like to be able to pan the bass, chords or right hand to the left or right audio out however I wanted to. I think you would get an awsome sterio image out of the KP-200S if you could assign the left side of the accordion to left audio out only and the right side to right audio out only.
I've read through the Millenium manual several times and I haven't found a menu option to do that.

Glad you are pleased with the KP-200S. You should have talked to Dan O'Neil, though, before buying from Music123. But, you have an opportunity to talk to Dano or George Kaye before your next purchase.

RJM