diff --git a/rsc3/main.rkt b/rsc3/main.rkt
index 00a4bae..55123da 100644
--- a/rsc3/main.rkt
+++ b/rsc3/main.rkt
@@ -1557,6 +1557,17 @@
 			      clear-sched
 			      (g-new1 1 0 0))))))
 
+;; port -> string -> ugen -> ()
+(define send-synth
+  (lambda (fd n u)
+    (async fd (d-recv (encode-graphdef (synthdef n u))))))
+
+;; port -> ugen -> ()
+(define play
+  (lambda (fd u)
+    (send-synth fd "anonymous" u)
+    (send fd (s-new0 "anonymous" -1 1 1))))
+
 ;; (socket -> a) -> a
 (define with-udp-sc3
   (lambda (f)
@@ -1576,6 +1587,18 @@
 ;; (socket -> a) -> a
 (define with-sc3 with-udp-sc3)
 
+;; ((socket -> a) -> a) -> (ugen -> ())
+(define audition-using
+  (lambda (f)
+    (lambda (u)
+      (f
+       (lambda (fd)
+	 (play fd u))))))
+
+;; ugen -> ()
+(define audition (audition-using with-udp-sc3))
+
+
 ;; [string]
 (define status-fields
   (list "# UGens                     "
@@ -1880,28 +1903,6 @@
   (lambda (n f)
     (mix (mce-fill n f))))
 
-;; port -> string -> ugen -> ()
-(define send-synth
-  (lambda (fd n u)
-    (async fd (d-recv (encode-graphdef (synthdef n u))))))
-
-;; port -> ugen -> ()
-(define play
-  (lambda (fd u)
-    (send-synth fd "anonymous" u)
-    (send fd (s-new0 "anonymous" -1 1 1))))
-
-;; ((socket -> a) -> a) -> (ugen -> ())
-(define audition-using
-  (lambda (f)
-    (lambda (u)
-      (f
-       (lambda (fd)
-	 (play fd u))))))
-
-;; ugen -> ()
-(define audition (audition-using with-udp-sc3))
-
 ;; float
 (define dinf
   9.0e8)
@@ -1973,4 +1974,46 @@
 
 ;; Local Variables:
 ;; truncate-lines:t
-;; End:
\ No newline at end of file
+;; End:
+
+
+
+
+
+(module+ test
+  (require rackunit)
+  
+  
+  ;; name, ugen expr -> bytes (synthdef)
+  ;; similar to send-synth in rsc3
+  (define (ugens->synthdef name ugens)
+    (encode-graphdef (synthdef name ugens)))
+  
+  
+  ;; these should not break
+  
+  (check-equal? (ugens->synthdef "sine" (mul (sin-osc ar 440 0) 0.1))
+                (bytes-append
+                 #"SCgf\0\0\0\0\0\1\4sine\0\3C\334\0\0\0\0\0\0=\314\314\315"
+                 #"\0\0\0\0\0\2\6SinOsc\2\0\2\0\1\0\0\377\377\0\0\377\377\0\1\2"
+                 #"\fBinaryOpUGen\2\0\2\0\1\0\2\0\0\0\0\377\377\0\2\2"))
+  
+  (check-equal? (ugens->synthdef "sine0" (out 0 (mul (sin-osc ar 440 0) 0.1)))
+                (bytes-append
+                 #"SCgf\0\0\0\0\0\1\5sine0\0\3\0\0\0\0C\334\0\0=\314\314\315"
+                 #"\0\0\0\0\0\3\6SinOsc\2\0\2\0\1\0\0\377\377\0\1\377\377\0\0\2"
+                 #"\fBinaryOpUGen\2\0\2\0\1\0\2\0\0\0\0\377\377\0\2\2\3Out\2\0\2"
+                 #"\0\0\0\0\377\377\0\0\0\1\0\0"))
+  
+  (check-equal? (ugens->synthdef "ring" (out 0 (mul (ring4 (f-sin-osc ar 800 0)
+                                                           (f-sin-osc ar (x-line kr 200 500 5 do-nothing) 0))
+                                                    0.125)))
+                (bytes-append
+                 #"SCgf\0\0\0\0\0\1\4ring\0\6\0\0\0\0DH\0\0CH\0\0C\372\0\0@\240\0\0>"
+                 #"\0\0\0\0\0\0\0\0\6\5XLine\1\0\4\0\1\0\0\377\377\0\2\377\377\0\3"
+                 #"\377\377\0\4\377\377\0\0\1\aFSinOsc\2\0\2\0\1\0\0\0\0\0\0\377\377"
+                 #"\0\0\2\aFSinOsc\2\0\2\0\1\0\0\377\377\0\1\377\377\0\0\2\fBinaryOpUGen"
+                 #"\2\0\2\0\1\0!\0\2\0\0\0\1\0\0\2\fBinaryOpUGen\2\0\2\0\1\0\2\0\3\0\0\377\377"
+                 #"\0\5\2\3Out\2\0\2\0\0\0\0\377\377\0\0\0\4\0\0"))
+  
+  )