Previously a hard-wired channel strip, ProChannel is now an ‘open’ plug-in host offering unprecedented effects order flexibility — which can make a huge difference to your sound...
Why have both a VST FX bin and a ProChannel? Well, the main ProChannel advantage is workflow; its effects are consolidated into a single channel strip, like the hardware mixer model, rather than spread over multiple open windows. Perhaps more importantly, you can save a channel strip as a single preset, as well as mix and match modules to create an all-Cakewalk channel strip, an emulation of a classic SSL console, a combination of the two, or something more à la carte — and have different strips in different channels!

Inserting the PC4K S-Type Channel compressor and the PC4K Expander/Gate, and setting the EQ to Vintage mode emulates an SSL 4000-series console’s channel strip.
Inserting the PC4K S-Type Channel compressor and the PC4K Expander/Gate, and setting the EQ to Vintage mode emulates an SSL 4000-series console’s channel strip.
Although you can now insert, remove and replace modules, the ProChannel EQ is an exception, as it’s always present (although you can collapse it or choose a more compact version if it gets in the way visually). As to third-party support, the Softube Saturation knob included with X1 Expanded was a harbinger of the future, as the Softube Mix Bundle (FET Compressor, Focusing Equalizer, Passive Equalizer and TSAR-1R reverb) is now available in the ProChannel format; additional third-party support is forthcoming.