Thanks Bill for putting this in another perspective.
The "sounding" qualities are going to be different when using different models just the fact that these are different models. The R1, R2 and Left will show a difference in sound quality anyway regardless if the composer is used or not. If the composer is used, then it will show some differences there as well, mainly due to the sound samples that's on the KN3000 vs the KN7000. But the rhythm pattern will remain the same.
It's a Technics thing that we have try to make the best of.
Anthony