VST plug-in versions

There are four versions of the FabFilter Pro-C VST plug-in that form all combinations of mono/stereo and with or without external side chain input:

FabFilter Pro-C (stereo without side chain)
FabFilter Pro-C (SC) (stereo with side chain)
FabFilter Pro-C (Mono) (mono without side chain)
FabFilter Pro-C (Mono SC) (mono with side chain).

The default VST plug-in does not have external side chain support because some hosts (e.g. Steinberg WaveLab) will not work correctly otherwise.

The external side chain feature in FabFilter Pro-C (SC) works well in Ableton Live 6 and in Tracktion 2 (use Tracktion's Rack feature to be able to route the side chain input).

With Steinberg Cubase, do the following to use an external side chain input:

Create a Group Channel track with Quadro configuration (in the More... menu).
Open the VST Connections window. In the Group/FX tab, locate the group bus you just created and right-click it to create child buses for the Stereo and Stereo (Ls Rs) parts.
In the Mixer, insert FabFilter Pro-C (SC) in the group channel track.
You can now route the input audio signal track to the Stereo child bus. The side chain track must be routed to the Stereo (Ls Rs) child bus. (The routing settings are found at the top of each channel.)
Use Pro-C's Audition feature to confirm that everything is routed as you want it.

Note: In earlier versions of Cubase, the Group/FX tab is missing from the VST Connections window. In this case, you must pan the input track to the front of the quadro bus, and the side chain track to the rear of the quadro bus. If you're using Cubase 4, make sure you have upgraded to version 4.02 to get everything to work.

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