I actually did not need to pre-compose the text layer. Nothing more than Fill with opacity controlled the expression + Bevil Alpha + Glow applied to a Text layer pre-comp. Here's a project that I did in about 3 minutes: Hovering over any point in the graph will tell you the exact values. Here's a typical section of one some stock footage of neon lights I have in my library: You can use the Graph editor to examine the values of Both Channels and then pick the point where you want the flicker to start. Then I would convert use the keyframe assistant to convert the Audio to Keyframes, select both channels and apply a linear(t, tmin, tmax, value1, value2) expression to the properties that would drive the flickering. If it were my project I would first create an audio track with using stock audio FX of a neon light turning on and flickering. Random and Wiggle will be hard to control and time.
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