hdf-0.11: Help/UGen/Filter/resonz.help.lhs
> import Sound.DF
> do { n <- white_noise_m
> ; r <- resonz (n * 0.5) 440.0 0.1
> ; audition [] (out1 r) }
> do { n <- white_noise_m
> ; f <- fmap (\x -> x * 3500.0 + 4500.0) (lf_saw 0.1 0.0)
> ; r <- resonz (n * 0.5) f 0.05
> ; audition [] (out1 r) }