diff --git a/nodes/audio_nodes.py b/nodes/audio_nodes.py
index 45c1799..35426f0 100644
--- a/nodes/audio_nodes.py
+++ b/nodes/audio_nodes.py
@@ -74,10 +74,11 @@ class OpRms:
         }
         return outv
 
-    def main(self, signal, **kargs):
+    def main(self, signal:dict, **kargs):
         y, sr = signal.get("y"), signal.get("sr")
         y, sr = self.f(y, sr)
-        return {"y":y, "sr":sr)
+        outv = {"y":y, "sr":sr)
+        return (outv,)
 
 # TODO: all the other ops