diff --git a/light9/collector/weblisteners.py b/light9/collector/weblisteners.py
--- a/light9/collector/weblisteners.py
+++ b/light9/collector/weblisteners.py
@@ -10,6 +10,10 @@ from light9.newtypes import (DeviceUri, 
 log = logging.getLogger('weblisteners')
 
 
+def shortenOutput(out: OutputUri) -> str:
+    return str(out).rstrip('/').rsplit('/', 1)[-1]
+
+
 class UiListener(Protocol):
 
     async def sendMessage(self, msg):
@@ -78,7 +82,7 @@ class WebListeners(object):
         for attr, val in attrs.items():
             outputUri, bufIndex = outputMap[(dev, attr)]
             dmxIndex = DmxIndex(bufIndex + 1)
-            attrRows.append({'attr': attr.rsplit('/')[-1], 'val': val, 'chan': (outputUri, dmxIndex)})
+            attrRows.append({'attr': attr.rsplit('/')[-1], 'val': val, 'chan': (shortenOutput(outputUri), dmxIndex)})
         attrRows.sort(key=lambda r: r['chan'])
         for row in attrRows:
             row['chan'] = '%s %s' % (row['chan'][0], row['chan'][1])