Uncapable to create scrolling waveform, help please

Thanks for reply, sorry for not gave more information.

The solution I tried is:

1. Import audio => Keyframe assistant > Convert audio to keyframes

2. New layer solid => Fx > Generate > Write-On

3. Write-On position expression:

offset_y =16 * thisComp.layer("Audio Amplitude").effect("Both Channels")("Slider");

[value[0], value[1] + offset_y ]

From this point I've tried many different things, the way I've been more close to what I wanted:

4. Add Displacement with Time Fx

5. Write-On position expression:

driftDirection = degreesToRadians (effect ("Displacement with time") ("Direction") - 90);

offset_x = Math.cos (driftDirection);

driftSpeed = effect ("Displacement with time") ("Speed (pixels / second)");

offset_x = offset_x * driftSpeed * (time-inPoint)

offset_y = 16 * thisComp.layer ("Audio Amplitude"). effect ("Both channels") ("Slider");

[value [0] - offset_x, value [1] + offset_y]

The waveform is drawn over the solid layer in right direction as the layer itself scrolls in the opposite direction, but when the position of the Write-On is outside the solid layer (logically) it stops drawing.

I tried to add Motion Tile to draw over and over the solid layer with a determinated stroke duration, but I don't know how to bring back the X position of the Write-On to 0 when it reaches 1920...

I very sure there's a easier and clean method to make what I'm trying to, but I got no idea of how.

Thanks again.