diff --git a/src/fenrir-package/soundDriver/sox.py b/src/fenrir-package/soundDriver/sox.py
index 12cbfca9..746c9ba1 100644
--- a/src/fenrir-package/soundDriver/sox.py
+++ b/src/fenrir-package/soundDriver/sox.py
@@ -6,6 +6,7 @@ class driver():
         self.proc = None
         self.volume = 1.0
         self.soundType = ''
+        self.soundFileCommand = 'play -q -v fenrirVolume fenrirSoundFile'
     def initialize(self, environment):
         return environment
     def shutdown(self, environment):
@@ -15,7 +16,9 @@ class driver():
     def playSoundFile(self, filePath, interrupt = True):
         if interrupt:
             self.cancel()
-        self.proc = subprocess.Popen("play -q -v " + str(self.volume ) + ' ' + filePath, shell=True)
+        popenSoundFileCommand = self.soundFileCommand.replace('fenrirVolume', str(self.volume ))
+        popenSoundFileCommand = popenSoundFileCommand.replace('fenrirSoundFile', filePath)
+        self.proc = subprocess.Popen(popenSoundFileCommand filePath, shell=True)
         self.soundType = 'file'
     def cancel(self):
         if self.soundType == 'file':