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Just want to be able to use Calkwalk with another Controller (with the flexibility of my VS 700) Please, please, please...
The Mackie MCU + C4 is a good combination, as are any of the Mackie clones.
I personally use an original Mackie MCU + Mackie Extender, with 2 x C4's. This gives me 16 motorised faders + 1 motorised master fader, transport control, loads of function buttons on the MCU.
The two C4's each give me two banks of 32 endless controller knobs (with a display for each knob) for controlling two separate plugins - I default them to Track Compressor and EQ, but I can scroll through all of my plugins and control them with the knobs.
There's loads of others out there, the most prominent being the Presonus FaderPort series, the Behringer X-Touch series and the Icon Q series.
For those on a budget, IMHO you can't beat the Korg NanoKontrol Studio (no motorised faders, but still a dream to use).