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well actually velocity means how hard you hit the key on the keyboard. So for instance if you gently tap it you'll get a low velocity, if you slam it you'll get a high velocity (they range from 0-127)
at itself it can control anything (with flexible synths that is) but it's normal to let it control VCA, so if you gently tap the key, the sound will come out soft, and if you jump on the key the sound will come out loud.
Of course you don't need to actually play snare rolls in from a keyboard, you can set velocity of a note in the midi event manager.
On a sidenote, often velocity also controls VCF cutoff in a subtle way, this translates, if you hit a piano key harder, more high frequencies will come out then if you tap it gently.
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