Don, I ran your recording through Izotope mastering essentials, to see if it could show some suggestions..
The setting I used gave it more stereo separation, adjusted eq a bit with some compression..

Maybe if you can adjust in the mastering section of the Korg, and get better results (globally).

When I compared the PA1000 to what I recalled the PA900 sounded like at Uncle Dave's ,,, The PA1000 lacked something to me... maybe as others have mentioned.. it has a "thin" sound..

From what I can hear on your recording a little more balance and EQ bass a bit..

I attached the Izotope version..