audio.c: get_audio_args()

src/game/scenes/ingame.c

@@ -10,6 +10,8 @@ static void ingame_tick(struct state *state) {
 
     world_drawdef(scn->world);
     player_calc(scn->player);
+
+    get_audio_args("soundtrack")->volume -= 0.01f;
 }