No, there are no such settings. The problem is either the player, or more likely, your sound files.
For determining whether it's your sound files, check if all sound files play with half speed, or only those created by you.
For determining whether it's the player, play them with snd_ functions and with media_ functions. If the problem occurs with snd_, it's the DirectX player; if it occurs with media_, there's something wrong with the CODECs installed on your PC.