Creating a sound wave?

[MJD]

I thought followed this video correctly, but apparently not … what did I do wrong and how can it be fixed?

Easy Grasshopper Tutorial (3d Parametric Design)

EZ Grashopper tutorial 3D Parametric Design Sound Wave.gh (13.0 KB)
Soundwave.3dm (32.6 KB)

[ferry59]

Use z-vector instead of y-vector