| Basically, it's tactile controls you can touch vs. ones you move around by clicking the mouse. Beyond that, it really depends on what you're trying to do. A control surface (like a cheap BCF2000) will hook into Cubase and directly control the mixer in Cubase. So you turn a knob on the mixer and it turns on your screen too. An analog mixer would have no interaction with the software and would only affect your audio coming into your interface. Some high end boards can even add a nice color to your sound by passing through the circuitry.
If you're happy with the sound you're getting and just want knobs and faders you can touch, get a control surface. If you want to color the sound a little (even cheap mixers will affect your sound, sometimes in a bad way though) or have more control over your sound before it gets to your interface, you may want a regular analog mixer.
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I'm allergic to frets
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