+ @property
+ def master_gain(self):
+ return gain(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)
+