diff --git a/light8/io.py b/light8/io.py
--- a/light8/io.py
+++ b/light8/io.py
@@ -1,21 +1,14 @@
-
-
 from parport import *
 
-DUMMY=1
-
-def init(DUMMY_in):
-    global DUMMY
-    if not DUMMY_in:
-        
-        getparport()
-        DUMMY=0
-
-def sendlevels(levels):
-    if DUMMY: return
-    levels = list(levels) + [0]
-    if levels[14] > 0: levels[14] = 100
-    # print "levels", ' '.join(["%3.1f" % l for l in levels])
-    outstart()
-    for p in range(1,70):
-        outbyte(levels[p-1]*255/100)
+class ParportDMX:
+    def __init__(self, dummy=1, dimmers=68):
+        self.dummy = dummy
+        if not dummy:
+            getparport()
+    def sendlevels(self, levels):
+        if self.dummy: return
+        levels = list(levels) + [0]
+        # if levels[14] > 0: levels[14] = 100 # non-dim
+        outstart()
+        for p in range(1, dimmers + 2):
+            outbyte(levels[p-1]*255 / 100)