What effect does velocity have on sound?

im fairly new to java sound, and i was playing around with channels and notes, i made myself a nice little program that plays 1-16 notes at the same time on the 1-16 channels of an midi synthesizer.... anyways, all the notes are set randomly, but the velocity stays constant? would i notice any difference (between the same note) if i changed the velocity? what effects if any does the velocity have?

Velocity is how hard the key was struck. It can have all sorts of effects on the sound, but mostly it affects the volume.

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