attenuation function for spectral visualizers?

[kensuguro]

Can anyone tell me, or point me to info about what the standard function is to attenuate the frequencies in a spectral visualizer. Basically, it's the difference between "normal" and "log" modes. I wan to do a "log" mode, but I can't find what the actual log function is.

hmm, on second thought, the "log" points to the frequency -> space distribution, and not how the higher frequencies are attentuated (visually).. but anyway, if anyone knows what I'm talking about, I'd appreciate some pointers. I mean, I know that all I have to do is to scale the value with some sort of pow function that takes frequency into account.. I just want to grab the standard one.

[kensuguro]

oh.. hmm, maybe I just need to log it. I guess the high end isn't being "attenuated" in the log view, but just being pushed so far off to the right, that I'm mainly seeing the lower, more active bandwidths. In that case, I guess I need to find that the log function is. Is it an log e? I'm not sure.

edit: so far, I just made an approximation with a:
for(var i:int=0;i < totalband; i++){
visualizerWidth * Math.pow(i/totalband, 0.3)
}
Which more or less looks right.