The Sigma is different from the normal buss mixer though, in that it's remotely controlled from a browser, has 16 stereo inputs, has two different mix busses (one to listen to and the other to feed back into the DAW to record) and is automated. The fader level of each channel can also be controlled from your DAW. Very cool. It retails for $4499, which isn't all that bad considering what you get.
Here's a video from the show by Sonic State that describes the unit in detail.
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