shithub: pt2-clone

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Add source of LED filter code in comment

--- a/src/pt2_ledfilter.c

+++ b/src/pt2_ledfilter.c

@@ -1,4 +1,6 @@

-// Crude Amiga "LED" filter implementation

+/* Biquad low-pass filter with resonance, from:

+** https://www.musicdsp.org/en/latest/Filters/38-lp-and-hp-filter.html

+*/

 #include "pt2_ledfilter.h"

 #include "pt2_math.h"