Some where I read that you can do this, more o less,
with the next steps:
1. Pop up your Winamp.
2. Set your Volume Control in Record Mode.
3. Open you Recorder (The one that come with Windows)
4. Play the MID.
5. Push the Record button.
* PC: Intel Core 2 DUO E6550 @ 2.33 GHz with 2 GB RAM: Archlinux w/ xfce4.
* Laptop: Intel Core 2 DUO T6600 @ 2.20 GHz with 4 GB RAM: Debian unstable w/ xfce4.