diff --git a/hugvey/story.py b/hugvey/story.py
index ec710dd..efb7589 100644
--- a/hugvey/story.py
+++ b/hugvey/story.py
@@ -1823,6 +1823,7 @@ class Story(object):
 
         params = message.getParams().copy()
         params['vol'] = params['vol'] * self.configuration.volume if 'vol' in params else self.configuration.volume
+        params['vol'] = "{:.4f}".format(params['vol'])
 
 #         self.hugvey.google.pause() # pause STT to avoid text events while decision is made
         self.hugvey.sendCommand({