GlissEQ is a powerful parametric dynamic equalizer plug-in.
The most interesting and unique feature GlissEQ offers is its filters with dynamic behavior. When using a normal equalizer you always get what you have set: if you specify a 6 dB boost at 100 Hz you get exactly a 6 dB boost at 100 Hz - GlissEQ offers you a slightly different approach: when you specify +6 dB at 100 Hz, you don't necessarily get 6 dB of gain, the filter's effective gain is adjusted dynamically according to the sound material you are filtering.
Such "dynamic behavior" of GlissEQ's filters gives you a friendly, assisting equalization experience. Boosting up the highs will not create the fatiguing effect of overload; boosting up the lows will not make things sound mushy. Instead, you will get a pleasant transient-emphasizing effect bringing life and dimension to your tracks. The pronunciation of the dynamic behavior can be controlled via special "Dyn" parameter. In reality, this "Dyn" parameter adds a whole new dimension to the equalizer as you know it, according to Voxengo.
Beside this "dynamic behavior", GlissEQ features a real-time spectrum analyzer. Moreover, the spectrum of a track can be exported to any other instance of GlissEQ thus making real-time inter-track spectrum comparisons possible. This can help you free frequency ranges in one track to allow the instrument in another track occupying same frequencies breathe.