diff --git a/oregano/examples/instrument-example.rkt b/oregano/examples/instrument-example.rkt
new file mode 100644
index 0000000..830d1f5
--- /dev/null
+++ b/oregano/examples/instrument-example.rkt
@@ -0,0 +1,24 @@
+#lang racket
+
+(require oregano)
+
+
+(define my-sin (preset-instrument "sin-inst"))
+
+(param-slider "change frequency" 300 1000 400
+                (lambda (val)
+                  (set-inst-param my-sin "freq" val)))
+
+(param-check-box "synth on" #f
+                 (lambda (v)
+                   (if v
+                       (inst-on my-sin)
+                       (inst-off my-sin))))
+
+(show-gui)
+
+;; example:
+(sleep 0.5)
+; (note-on my-sin 500 1)
+
+; (note-off my-sin)
\ No newline at end of file
diff --git a/oregano/instrument.rkt b/oregano/instrument.rkt
index c46b34c..f506068 100644
--- a/oregano/instrument.rkt
+++ b/oregano/instrument.rkt
@@ -1,16 +1,15 @@
 #lang racket
+
+
 (require rsc3)
 
 
-;; --- gui stuff
+(provide (all-defined-out))
 
+;; TODO - remove. using "signal-slider" for testing
 (require "gui.rkt")
 
 
-; ------- end of gui stuff
-
-
-
 (define current-node-id 1000)
 (define (gen-node-id)
   (set! current-node-id (add1 current-node-id))
@@ -98,7 +97,7 @@
 
 
 ;; ========  example useage ===========
-
+#|
 (define my-sin (preset-instrument "sin-inst"))
 
 (param-slider "change frequency" 300 1000 400
@@ -119,5 +118,4 @@
 
 ; (note-off my-sin)
 
-
-
+|#
diff --git a/oregano/main.rkt b/oregano/main.rkt
new file mode 100644
index 0000000..0652319
--- /dev/null
+++ b/oregano/main.rkt
@@ -0,0 +1,13 @@
+#lang racket
+
+
+(require "instrument.rkt"
+         "gui.rkt"
+         "sample.rkt")
+
+(provide
+ (all-from-out "instrument.rkt"
+               "gui.rkt"
+               "sample.rkt"))
+ 
+