diff --git a/src/fenrir-package/sound/sox.py b/src/fenrir-package/sound/sox.py
index f85ff6b8..b1aa8ff8 100644
--- a/src/fenrir-package/sound/sox.py
+++ b/src/fenrir-package/sound/sox.py
@@ -3,3 +3,9 @@
 class sound():
     def __init__(self):
         pass
+    def playFrequence(self, frequence, duration, adjustVolume):
+        pass
+    def playSoundFile(self, Path):
+        pass
+    def shutdown(self):
+        pass