After Effects Expressions (Tribal Trap Audio Visualizer)

Scale expression:

minAudio = 0;  		 /*  Minimum amount of audio reaction */
maxAudio = 100; 		/* Maximium amount of audio reaction */
minStretch = 120;		/* Minimum amount of scale. This is where your layer will be by default if there is no audio playing */
maxStretch = 160;		/* Maximum amount of scale. This is how far the scale goes */
udioLev = thisComp.layer("Sound Keys").effect("Sound Keys")("Output 1");		/* Change "Output #" to your soundkeys output you want the expression to use */
s = linear(audioLev, minAudio, maxAudio, minStretch, maxStretch);
[s,s]

Smooth expression:

s = smooth(.3,5)

Source video:
https://youtu.be/kelTyIH_JMs