Audiosurf Mechanics: Insights, Speculations, and Tests.

[Melodia]

I'm sure I mentioned this before, but I think it's that music with heavy overtones (massed strings, organ, 8-bit music) will create heavy traffic.

[Lu Tze]

Audiosurf track intensity depends mostly on high frequency tones, like a Hi Hat - but then those values are normalized! This means that a track with a continuous amount of high frequency sounds, like a Trance track, creates a fast track - and so does some track which contains virtually no high frequencies at all, since lower frequencies are usually distributed much more evenly.

[ThePich]

i have tried with brown, pink and white noise, the traffic is almost the same (-1 for pink, -2 for white).
also i hace tried to [as-steep] a brown noise track, it becamed completely green (read: flat).