Geometry Nodes: How can I use baked sound F-curve data as a math function?

Question

I want to use baked sound F-curve instead of sin and cos in expression for Trefoil knot:

\begin{aligned}x&=\sin t+2\sin 2t\\y&=\cos t-2\cos 2t\\z&=-\sin 3t\end{aligned}

Is it possible to set position of curve in Geometry Nodes using F-curve data as function?

Method I tried: recreate curve shape with simulation. Baked f-curve input as "Signal":

Then i tried to call the Z coordinate of the resulting curve for the given index.

I thought that I could replace sin with this group as a math function. But it doesn't work.

Answer 1

• create a value node and right click (or press i) and add a keyframe
• then open up the graph editor and select the keyframe
• select Channel > Bake Sound to F-Curves
• then locate your audio file and select it.