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I really only use this on certain bass sounds, particular the FM ones. I really like it though. It produces very digital type sound effects. It's easy to use and program and the interface is very inspiring.
I love the choice of presets and the interface is very intuitive. It doesn't focus on exact frequencies or numbers. You're definitely more dependent on actually listening (just the way I like it). Probably my only gripe is the slight attenuation of the higher frequencies when the plug is activated.