[music-dsp] modelling a spring reverb

[Juhana Sadeharju]

Guys, check the work of Rocchesso on FDNs: one multiply per the whole
FDN, not one per delay --- in IEEE Signal Processing Letters, 1997.

Csound has an FDN reverb written by Rocchesso (but not the efficient
version).

Don't forget to test your reverbs. One doesn't need 32 delays for
a good FDN reverb. 8-12 will suffice. By the way, don't listen to
impulse responses: they may damage your ears, and they tell almost
nothing about the quality of the reverb. I use 5-20 ms noise signals
as main test signals, but I have speech, vocals and music too.

Juhana

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