Thanks for the quick reply. I too have the zlx. Everything sounds just fine with what I have so far. And I don't have the jack to drop on a $1500+ amp modeller that already loads different responses. But if It makes a noticeable difference in sound quality, it just seems a small price to pay to improve on the 11. They are almost giving these things away. Mine was $400 new with no pt almost two yrs ago. My interest is sparked by what I read on the interwebs about how great the amp sims on most midrange modellers. Seems the weak link is in the cab sims on most. Mainly stuff I've read on this thread.
Thanks again.
Danny.