diff --git a/show/dance2016/deviceClass.n3 b/show/dance2016/deviceClass.n3
--- a/show/dance2016/deviceClass.n3
+++ b/show/dance2016/deviceClass.n3
@@ -11,6 +11,8 @@
 :focus              a :DeviceAttr; :dataType :scalar .
 :iris               a :DeviceAttr; :dataType :scalar .
 :prism              a :DeviceAttr; :dataType :scalar .
+:strobe             a :DeviceAttr; :dataType :scalar;
+  rdfs:comment "0=none, 1=fastest" .
 :goboSpeed          a :DeviceAttr; :dataType :scalar ;
   rdfs:comment "0=stopped, 1=rotate the fastest".
 :quantumGoboChoice  a :DeviceAttr; :dataType :choice;
@@ -108,9 +110,9 @@
 
 :MacQuantum a :DeviceClass; 
   :docs <http://www.martin.com/Martin.Download.aspx?file=/files/files/productdocuments/11_MANUALS/999/35000279b%20UM_MACQuantumProfile_EN_B.pdf>;
-  :deviceAttr :color, :rx, :ry, :zoom, :focus, :iris, :prism, :quantumGoboChoice, :goboSpeed;
+  :deviceAttr :color, :rx, :ry, :zoom, :focus, :iris, :prism, :quantumGoboChoice, :goboSpeed, :strobe;
   :attr
-    [ :dmxOffset 0; :outputAttr :shutter ; rdfs:comment "use 30" ],
+    [ :dmxOffset 0; :outputAttr :shutter ],
     [ :dmxOffset 1; :outputAttr :dimmerFadeHi ],
     [ :dmxOffset 2; :outputAttr :dimmerFadeLo ],
     [ :dmxOffset 3; :outputAttr :cyan ],