You can use something like this (you’ll have to adjust the first four parameters to fit your project):
minAudio = 0;
maxAudio = 15;
minScale = 10;
maxScale = 100;
myAudio = thisComp.layer(“Audio Amplitude”).effect(“Both Channels”)(“Slider”);
temp = linear(myAudio, minAudio, maxAudio, minScale, maxScale);
[temp, temp, temp]
Dan