FabFilter Pro-G Help
Full Screen mode, resizing and scaling
The section at the right of the interface contains the controls that affect the speed and feel of the current chosen gate/expander style.
With the Style selection button, you can choose between various gate/expander styles, all tailored and fine-tuned carefully to meet specific needs or offer a certain character:
All styles have built-in, carefully tuned hysteresis where needed. This will cause the gate to close at a slightly lower threshold level than the threshold at which it will open (as set by the Threshold knob), avoiding flutter when the incoming audio signal hovers around the threshold.
The Attack knob sets the speed with which the expander/gate will open when the signal level exceeds the threshold. For transient-rich program material like drums, fast attack times are needed to preserve punch. FabFilter Pro-G is capable of very fast attack times and they are program dependent.
The Release knob sets the time that the expander/gate takes to close and reach maximum gain reduction. Just like the attack, the behavior is very program dependent, depending heavily on the audio you're processing.
The Hold knob sets the minimum time that the gate/expander will remain fully opened after the sound level has exceeded the threshold.
By choosing a custom soft knee setting, the gate/expander will react more gradually when sound drops below the threshold. You can of course clearly see the effect of the Knee in the transfer curve shown within the level display.
With the Lookahead knob (often also called pre-open), the gate/expander can be set to open up to 10 ms before the audio level actually exceeds the threshold. This is an excellent way to preserve transients, while still avoiding ultra-fast attack times that might cause distortion or aliasing.
You can enable or disable look-ahead with the Lookahead Enabled button, just at the right-top of the Lookahead knob. When look-ahead is disabled and oversampling is off, Pro-G works without any latency. When enabled, the latency will be 10 ms, plus a small additional latency if oversampling is enabled.
Tips
Next: Metering
See Also
Dynamic controls
Oversampling