Sound/music volume

Hi can anyone help me understand how to make it so sounds/music fade in & out basically?
I wanna publish episode 1 of my story but I really wanna sort out the music on it first x

music music_name
volume music 50 3000
(3000 milliseconds is 3 second)

volume sound x T
volume music x T
x is volume level 0 to 100
T is time in milliseconds

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Thank you xx