Intelligent Adaptive Filtering
Character's simple user interface doesn't mke it obvious what is going on under the hood but apparently it uses Noveltech's Intelligent Adaptive Filtering (IAF) technology. The processing affects both the frequency response and dynamic properties of the input material rather than merely boosting a specific frequency region. In use it is very simple to use, just select the appropriate mode, dial in some character and focus the processing on the desired area using the target control.
Hear the results of some stem (over)processing of a loop consisting of drums, percussion, bass, electric piano, synths and electric guitar.