Velocity w.r.t. sound

Reading about, in the world of synth Velocity seems to be how the sound changed in relation to the speed/force you push a keyboard button or strum a guitar.
What does it mean with regards to the PlayDate though? I can only think that it's related to the attack value of the envelope.

It still means how 'hard/pressure' you hit the note in the synth. Quite different to attack in an envelope. usually most notable change is loudness.

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The penny just dropped.

The actual velocity is set with playdate.sound.envelope:trigger(velocity, [length]).