1 files changed, 2 insertions, 2 deletions

diff --git a/helpers/mapping.py b/helpers/mapping.py
index d9b7ba0..84845fc 100644
--- a/helpers/mapping.py
+++ b/helpers/mapping.py
@@ -28,8 +28,8 @@ class Mapping(RelativeLayout):
     def master_gain(self):
         return gain(self.master_volume)
 
-    def set_master_volume(self, value, add = False):
-        [db_gain, self.master_volume] = gain(value + int(add) * self.master_volume, self.master_volume)
+    def set_master_volume(self, value, delta = False):
+        [db_gain, self.master_volume] = gain(value + int(delta) * self.master_volume, self.master_volume)
         for music in self.open_files.values():
             music.set_gain(db_gain)