diff --git a/mqtt_srv.py b/mqtt_srv.py
index 36dfef7..90dd629 100755
--- a/mqtt_srv.py
+++ b/mqtt_srv.py
@@ -669,10 +669,17 @@ def on_message(client, userdata, msg):
             writeLog(myCmd)
             subprocess.Popen(myCmd.split())
         if myObj["cmd"] == "assist":
-            if myObj['target'] == "start":
-                myCmd =f'powershell "& ""c:\\Program Files\\jaydee\\vol_control.ps1""" 0.2'
+            if curos == "Windows":       
+                if myObj['target'] == "start":
+                    myCmd =f'powershell "& ""c:\\Program Files\\jaydee\\vol_control.ps1""" 0.2'
+                else:
+                    myCmd =f'powershell "& ""c:\\Program Files\\jaydee\\vol_control.ps1""" 1'
             else:
-                myCmd =f'powershell "& ""c:\\Program Files\\jaydee\\vol_control.ps1""" 1'
+                if myObj['target'] == "start":     
+                    myCmd =f'amixer set Master 100%'
+                else:
+                    myCmd =f'amixer set Master 20%'
+                
             writeLog(myCmd)
             output = subprocess.Popen(myCmd, shell=True)
             writeLog(output)