<<So it didn't seem to cut anything off, merely make it quieter.>>
That is in fact what a filter is doing. You just didn't have a steep
enough cutoff slope.
<<Is there a way to actually cut off the lower frequencies? Or turn
them down without effecting the higher frequencies? >>
That is the description of a highpass filter.
<<What I imagine would be useful is something which actually lets me
cutoff frequencies below a certain level, and also lets me choose the
steepness of the curve of how sudden the cutoff is. Or even just shape
the whole frequency curve as I choose.>>
The Waves Renaissance EQ gives you control over the steepness of the
HPF cutoff, while giving you the choice of a 2, 4 or 6 band parametric
equalizer. The absolute steepest highpass cutoff I've come across is
in the WaveArts Trackplug. There's pretty much nothing left below the
cutoff frequency. The problem with really high order filters, unless
they are specifically designed as minimum phase filters, is that they
ring at the cutoff frequency. You really hear it with the Trackplug,
but you do get an incredibly steep cutoff.
Scott Fraser
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause
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