diff --git a/rsc3/examples/moog-filter.rkt b/rsc3/examples/moog-filter.rkt
new file mode 100644
index 0000000..4641666
--- /dev/null
+++ b/rsc3/examples/moog-filter.rkt
@@ -0,0 +1,83 @@
+#lang racket
+
+(require rsc3 rhs/rhs)
+
+(with-sc3 (lambda (fd)
+            (send fd (g-new1 1 add-to-tail 0))))
+
+#|
+(define cymbalism
+  (let* ((p 15)
+         (f1 (rand 500 2500))
+         (f2 (rand 0 (mouse-x)))
+         (y
+          (lambda ()
+            (let ((f (replicate-m p (add f1 (rand 0 f2))))
+                  (rt (replicate-m p (rand 1 5)))
+                  (a (replicate p 1)))
+              (klank-data f a rt))))
+         (z (mce2 (y) (y)))
+         (t (impulse ar (rand 0.5 3.5) 0))
+         (n (mul (white-noise ar) 0.03))
+         (s (mul (decay t 0.004) n)))
+    (klank s 1 0 1 (mce-transpose z))))
+
+(audition (out 0 cymbalism))
+
+|#
+
+(with-sc3 reset)
+
+#|
+(let* ((x (mouse-x kr 220 440 0 0.1))
+       (f (mce2 x (lag2 x 0.2))))
+  (audition (out 0 (mul (sin-osc ar f 0) 0.1))))
+
+|#
+
+;; help/ugen/filters/moog-ff.help.scm
+#;(let* ((n (mul (white-noise ar) 0.1))
+         (y (mouse-y kr 100 10000 1 0.1))
+         (x (mouse-x kr 0 4 0 0.1)))
+    (audition (out 0 (moog-ff n y x 0))))
+
+;; lorenz-l.help.scm
+#;(let* ((n (mul (white-noise ar) 0.1))
+       (y (mouse-y kr 40 80 1 0.1))
+       (x (mouse-x kr 2 10 0 0.1))
+       (lz (mul (lorenz-l ar sample-rate
+                         x ;(mul-add (lf-noise0 kr x) 2 10)
+                         y ;(mul-add (lf-noise0 kr 20) 20 38)
+                         1.6; (mul-add (lf-noise0 kr 1) 1.5 2)
+                         0.05
+                         0.1 0.0 0.0)
+               0.2)))
+  (audition
+   (out 0 lz)))
+
+#;(let ((fb (line kr 0.01 4 10 do-nothing)))
+  (audition
+   (out 0 (mul (fb-sine-c ar sample-rate 1 (mouse-x kr 1 5 1 0.1) 1.1 (mouse-y kr 0.5 1 1 0.1) 0.1 0.1) 0.2))))
+
+;; fb-sine-c.help.scm
+(let* ((x (mouse-x kr 0.1 1 0 0.1))
+       (f (lambda (m a) (mul-add (lf-noise2 kr x) m a))))
+  (audition
+   (out 0 (mul (fb-sine-c ar
+			  (f 1e4 1e4)
+			  (f 32 33)
+			  (f 0.5 0)
+			  (f 0.05 1.05)
+			  (f 0.3 0.3)
+			  0.1
+			  0.1)
+	       0.2))))
+
+;; like old telephone ring. uses key-state aaaa
+#; (let ([freq (mouse-x kr 600 2000 1 0.1)])
+  (audition (out 0 
+                 (mul (sin-osc ar 
+                               (mul-add (lf-pulse ar 15 0 0.5) 200 freq)
+                               0)
+                      (key-state kr 38 0 0.1 0.1)))))
+