Squashed 'l1/' content from commit 670aa58

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sexp_effects/effects/noise.sexp

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+;; Noise effect - adds random noise
+;; Uses vectorized add-noise primitive for fast processing
+
+(define-effect noise
+  :params (
+    (amount :type int :default 20 :range [0 100])
+  )
+  (add-noise frame amount))