Direct3D9 was removed a very long time ago, now we only have Direct3D11 and OpenGL.
If the game and the music are slow, it's very likely that you're not running the game at full speed. Check the title bar of the window, it should have some information like VPS and FPS.
If the game and the music are slow, it's very likely that you're not running the game at full speed. Check the title bar of the window, it should have some information like VPS and FPS.