what exactly does?

[that kid]

velocity do? i tryed using it but can't really hear what it's doin. what sounds would you typical put velocity on ? - that kid

 

[rob-beatz]

...from a google search

Velocity - the force in which a note is pressed or played (attacked) and released. (i.e., the harder the note is pressed, the louder it will sound.) The range of velocities is 0-127. Some keyboards feature 'velocity sensitive keys' and some drum machines and percussion controllers may feature 'velocity sensitive pads'. Velocity on wind controllers may be controlled by the amount of air stream produced into the instrument.

 

[Vince]

yeah, rob-beatz answered it pretty well.
if you play your sounds on a keyboard the velocity will be recorded.

 

[Chrono]

a great short-key velocity sensitive keyboard is the m-audio evolution mk-425C

 

[sYgMa]

Velocity = Volume or the strengh you press your keys on a keyboard/midi controller/"piano"

 

[Fade]

I guess you didn't notice the Glossary, here's the definition:

"VELOCITY
An aspect of MIDI note messages that indicates how fast a note is attacked. In the case of a keyboard, it measures how fast a key travels down (Velocity) or up (Release Velocity). It is not to be confused with aftertouch, which measures how hard a key is pressed after the note has been played."

From: https://www.illmuzik.com/technical/glossary.php?ID=82