Pierre,
I'm not sure about the KN6000, but on my X1, the EQ controls for the mic input were part of the harmony processor. Maybe, check that out. Otherwise, you can use an external EQ
(like a guitar pedal) BEFORE you put the mic into the input. I remember the Karaoke echo on the KN5000, and it IS way too dark for my taste. I think it's a very low rez effect, and I could never use it in a pro situation. If you don't plan on using harmony, and the EQ is NOT internal - I'd recommend a good vocal processor that's dedicated to your mic before it goes into the keyboard. I really like the "acous-TEC" unit by DOD. It's made for acoutic guitar, but all the essentials for voclas are in it. EQ, Rev, Del, Chorus - it's pretty cool, and it's small. You also have built in footswitches to turn the different effects on & off. Check it out. It's about $150 US.

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Uncle Dave