Standard audio low pass filters tend to work by adjusting the corner
> instead of the roll off or in some sense a one sided Q. So your
> standard treble control is a simple RC low pass filter with R being a
> pot. We have been conditioned by years of use to understand how these
> filters work but they are not the only ones.
>
> What about changing the roll off rate instead or as a combination with
> the corner? Something that shifts the corner and increases the roll
> off? I suppose this is hard to realize in hardware because it requires
> a way to vary between a large number of poles smoothly? At least in
> the analog domain.
>
> I wonder what such filters would look like and sound like?
Never heard of the Leak Vari-slope then
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Chris