Add song beats. Need pace adjustment

assets/models/arrow.obj

@@ -0,0 +1,15 @@
+# Blender v2.79 (sub 0) OBJ File: 'cube.blend'
+# www.blender.org
+o arrow
+v 0.102970 0.103067 0.148550
+v -0.102970 0.103067 0.148550
+v 0.000000 0.039580 0.148550
+v 0.102970 0.087624 0.148550
+v 0.000000 0.103067 0.148550
+v -0.102970 0.087624 0.148550
+vn 0.0000 0.0000 1.0000
+s off
+f 5//1 4//1 1//1
+f 5//1 6//1 3//1
+f 5//1 3//1 4//1
+f 5//1 2//1 6//1