diff --git a/src/modules/l_audio.c b/src/modules/l_audio.c
index a908dbb..ed9d665 100644
--- a/src/modules/l_audio.c
+++ b/src/modules/l_audio.c
@@ -5,14 +5,23 @@
  * under the terms of the MIT license. See LICENSE for details.
  */
 
+ #include "lib/cmixer/cmixer.h"
  #include "luaobj.h"
 
 
+int l_audio_setVolume(lua_State *L) {
+  double n = luaL_checknumber(L, 1);
+  cm_set_master_gain(n);
+  return 0;
+}
+
+
 int l_source_new(lua_State *L);
 
 int luaopen_audio(lua_State *L) {
   luaL_Reg reg[] = {
-    { "newSource",  l_source_new   },
+    { "newSource",  l_source_new        },
+    { "setVolume",  l_audio_setVolume   },
     { 0, 0 },
   };
   luaL_newlib(L, reg);