diff --git a/light9/midifade/midifade.py b/light9/midifade/midifade.py
--- a/light9/midifade/midifade.py
+++ b/light9/midifade/midifade.py
@@ -98,6 +98,10 @@ def writeHwValueToGraph(graph: SyncedGra
     graph.patchObject(ctx, fadeSet, L9['value'], valueLit)
 
 
+def changeGrandMaster(graph: SyncedGraph, newValue: float):
+    graph.patchObject(ctx, L9.grandMaster, L9['value'], decimalLiteral(newValue))
+
+
 def onMessage(graph: SyncedGraph, ctx: URIRef, m: Dict):
     if m['type'] == 'active_sensing':
         return
@@ -108,6 +112,9 @@ def onMessage(graph: SyncedGraph, ctx: U
         if m['dev'] == 'bcf2000' and m['control'] == 92:
             changePage(graph, 1)
             return
+        if m['dev'] == 'bcf2000' and m['control'] == 8:
+            changeGrandMaster(graph, clamp(m['value'] / 127 * 1.5, 0, 1))
+            return
 
         try:
             fader = {