[Vorbis] OFF-TOPIC audio fade curves

[Ross Levis]

This is off topic but I'm sure many subscribed here may be able to help.  I'm writing an audio player, which includes vorbis of course, for the broadcasting industry and I need to prematurely fade out songs before they have finished.  I've tried a linear and a logarithmic fade but neither sound natural to me.

I was never good at logarithms in school and that was a long time ago.

Can anyone provide a formula which provides a fade that the ear would perceive as even and  steady?  Or even better, a variable way of adjusting the log curve between logarithmic and linear.  I've searched the Net but haven't found anything useful.

Many thanks,
Ross.
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