Parametric EQ would be cool. Especially if you develop a good UI for it.
I'm thinking maybe like a custom QWidget that lets you move the filter
points directly in the frequency response graph.
You'll probably want to use biquads for the filters. There's a good
biquad implementation in basic_filters.h, it's used for the first 6 or
so filters in the filter list. There is no peak/shelf filter
implementation, but it's just a matter of passing different coeffs to
the biquad. I've been thinking we should put the biquad implementation
in its own class anyway, so this could be a good opportunity to do it.
Then you could use the biquad class directly in your plugin and wouldn't
have to rewrite it from scratch.
You want me pull to code into a class?
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