diff --git a/mqtt_srv.py b/mqtt_srv.py
index 90dd629..0e6994f 100755
--- a/mqtt_srv.py
+++ b/mqtt_srv.py
@@ -679,7 +679,7 @@ def on_message(client, userdata, msg):
                     myCmd =f'amixer set Master 100%'
                 else:
                     myCmd =f'amixer set Master 20%'
-                
+                status, output = subprocess.getstatusoutput(myCmd)
             writeLog(myCmd)
             output = subprocess.Popen(myCmd, shell=True)
             writeLog(output)