How are you returning the effected signal back to the mixer, are you using the aux returns?
I find you only need about 30 to 40% back to be noticable.

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The Sonic Energy Authority - a sound investment

Yes, the returns. The MX2642 has stereo inputs that double as returns. I've set the 'aux' levels to zero to avoid feedback. The 'level' setting is at 50%. My send pots are at about 25%. I'll check it later today (it's 5am now). Might be the 50% that is causing the overkill.

-tek