Question on how to fade in and fade out sounds

[Bweadies-UwU]

only way besides the 3 dots that I can think of is using alot of markers to slowly lower volume

granted that will likely not be smooth

wdym?

markers cant be a constant change without near spam which even close together leaves the amount of beats from the top volume to get to the wanted fade
 
for example 90 to 30 will take 60 beats to fade if each marker is 1 beat apart

gotta correct myself gradual fades will work but constant fades wont