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FFX-4 plug-in (VST or DX) allows managing 4 Direct-X plug-in into a virtual patch bay in easy way. Originally done for complex mastering in the age when DAWs were not working in floating point to transport signal.
The FFX-4 is always useful for complex mastering where several plug-ins needs to be chained like EQ + Multiband Compressor + Reverb + Special EQ + Limiter + Harmonic manager + Measure tools...
The FFX-16 version can be bought online if you need to manage more than 4 plug-ins in the chain.