I think Unmix levels is one of the more powerful and useful modules that I would like to see more done with.
-Multiband with crossover and slope control (ie, being able to have different settings for Low Freq, Mid, High Freq)
-Decay time (allows preservation of tails on isolated target material)
-Harmonic preservation (preserver higher frequencies of target isolated material)
-Noise Floor checkbox option and threshold level (separates noise floor to a separate layer)