• Adobe After Effects Expressions

  Audio Amplitude Expression Question

  Posted by Christine P. on June 7, 2005 at 5:15 pm

  I am using an expression to link the opacity of one layer to the Audio Amplitude layer. My problem is that since the range of my audio layer is so minimal, the opacity change is not visible to the eye. Is there a way to set the minimum and maximum range so that my minimum value of the audio layer becomes 0% opacity and the maximum becomes 100% opacity.

  I appreciate any help you may be able to give!

  Thanks,
  Christine

  Christine P. replied 20 years, 11 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  June 7, 2005 at 5:58 pm

  Something like this should do it:

  minAudio = 0;
  maxAudio = 15;
  minOpacity = 0;
  maxOpacity = 100;

  audio = thisComp.layer(“Audio Amplitude”).effect(“Both Channels”)(“Slider”);
  linear(audio,minAudio,maxAudio,minOpacity,maxOpacity)

  Adjust the parameters to fit your situation.

  Dan
• 

  Christine P.

  June 7, 2005 at 6:05 pm

  Thanks so much for your help! I tweaked the numbers to fit my parameters and it’s working wonderfully.

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