Diki,
The Master EQ on the Tyros 3 is outstanding and does a great job at getting the sound you want. Once set, I have never had to mess with it. The only problem is that it is not real easy to make adjustments on the fly if needed at a gig.

With my Bose Classic L1 I have a module that controls Highs, Mids, and Lows. It is part of the L1 Classic package and is really handy on gigs. I guess that is what I am after - the ease of making quick changes if needed. Every so often at a gig I will need to ajust the EQ values and I have gotten accustom to having the little box sitting next to me.
Hammer