• Adobe After Effects Expressions

  Audiokeys to slider?

  Posted by Mikkel Aabenhuus on July 30, 2008 at 12:24 pm

  I am having problems combining a logos opacity to an audiotrack, and adding a slider so that opacity slowly goes to 100%

  …Im adding a slider expression control but cnat figure out what to combine it with?? 🙁

  Can anybody help?

  /Mikkel

  Thank you
  Mikkel Aabenhuus

  Chris Jepson replied 18 years ago 2 Members · 1 Reply
• 1 Reply

• 

  Chris Jepson

  August 2, 2008 at 5:22 pm

  Hi Mikkel,
  what I think you need to do is;
  right click the audio> keyframe assistant, convert audio to key frames
  this will make a new layer which has a slider with values based on the audio. you can get rid of left+right channels, you only need ‘both channels.’
  now, go to your logos opacity, Alt click the stopwatch so you can enter an expression.
  Use the pick whip (it looks like a spiral) and pick the slider.
  this basically links opacity to audio.
  if for instance your opacity is too low (never over 20%)
  try adding something like +50; or *5; at the end of the expression.
  that will get the value of the slider, and add 50 or times 5.
  -chris

  ))<>((

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