ResEQ is a universal binary AU plugin that gives you up to eight parallel resonant filters. It uses convolution modeling of an idealised analog-style peak impulse for extremely rich textures, and can do 'parked wah' effects of great sophistication. ResEQ is $59.99.
Note that effectively ResEQ gets rid of anything that will mask other instruments or get in the way in the mix- by centering on a whole bunch of different frequencies and discarding everything else, you can totally whack distortion-fizz no matter what the original tone sounds like. I'd suggest saving good settings as Logic presets, because it might take some time dialing them in, but with eight frequencies available you can have 'secret guitar voicings' as tricky to work out as a secret sauce. Try to find spaces in the frequency range to fill out the sound- some midrange, some up in the treble or supertreble, some down lower. The result will resemble a fullrange sound, but it will not mask other mix elements hardly at all.
Try the demo of this by downloading the demo collection! You're not allowed to use the demo for actual work. It politely mutes itself briefly every couple minutes, and that's the only thing it does to spite you. It won't expire or do anything to you, and when you get the actual plugin, throw away the demo and put the real version in its place and most software should replace saved instances of the demo with the real thing seamlessly, retaining any settings. Please support my cooperative, unhostile demos with sales of the real software.
