FSynth Pro is an audio effect that allows you to modify the envelope and filter characteristics of audio tracks as if it contained MIDI data. This means that attack, decay, sustain and release characteristics of audio event can be changed, as well as filter envelopes.

FSynth Pro detects new audio events in the incoming audio signals, and configures an internal synthesizer in real time to sound very similar to the detected event. The envelope and filter characteristics of this internal synthesizer can subsequently be modified to drastically change the character of audio events.