Addition to Audio volume to scale(layer) expression?

[Roland R. kahlenberg]

Lots of similar Qs been posted here. Best to perform a Search using the word “Interpolation”

Cheers
Roland Kahlenberg
https://www.broadcastGEMs.com – Adobe After Effects project files
https://www.myspace.com/rorkrgbspace

[Markofcain]

Set up the comp by:

1) Convert the Audio to key frames
2) select the layer you want to toggle on and off
3) open the opacity — “T” Key
4) Alt click the stopwatch (PC assumed here)
5) drag the pick whip to the audio slider

AE will generate an expression for you like:
thisComp.layer(“Audio Amplitude”).effect(“Both Channels”)(“Slider”)

We want to change this so that we can modify the value before it gets passed to the opacity. What we need to do is:
1) assign a variable to the audio levels
2) assign a variable to the opacity level
3) set a lower limit value below which the opacity is zero and above which the opacity is set to 100.

So now the expression looks like this:

signal_value = thisComp.layer(“Audio Amplitude”).effect(“Both Channels”)(“Slider”);
if (signal_value < 25 ) { opacity_value = 0; } else { opacity_value = 100; }; opacity_value; The logic is intuitively obvious to the most casual observer -- but I will walk you through just in case: The conditional statement of the expression constantly checks the value of the variable "signal_value." If the value of variable "signal_value" is less than 25, then the expression path flows to the statement immediately below where the variable opacity_value is set to zero. If, however, the value of the variable "signal_value" is 25 or greater, then the expression path jumps to the statement immediately below the "else" where the variable opacity_value is set to 100. Finally, the last line "returns" or announces the opacity_value to the layer. HTH Mark Cain Sarasota, FL USA