hi recently ive been trying to add some audio to my maps, but it says mp3s are not supported.
i checked out some converting programs but they only convert half the sound so u gatta pay.
i tried thundergraft, didint even open for me.
PLZ HELP

Audacity is your friend.

iTunes will also convert mp3 to wav.

I use Sony Acid Pro 7, it's like the Photoshop of audio.

Of course it isn't free by any means, but you can always torrent it.

When using audacity, (use the 1.3 beta version, it's much better) there are 2 things you need to do before you import your mp3 file. Under edit->preferences (crtl+p)->Quality change the bit depth to 16 bit and change the project rate to 11025 Hz (you can modify the rate to more or less, but IMO going from 8000->11025 is like going from 11025->41000). It will sound crappy, but such is life. If you don't do it, your map is going to be enormous. SC will compress 16 bit wav files to ~45% of their normal size.

Alternatively, you can leave everything in preferences at the default and change the project rate in the bottom left corner of the screen, and change the bit depth on the left hand side of the track, under the dropdown menu. The set rate under that particular menu speeds up/slows down the audio.

Finally, if it's stereo (which it probably is), make sure you change it to mono, under the same dropdown menu (split stereo to mono). Stereo doubles the size of the file, and it's kind of pointless in SC anyway.

After you're done editing the file, File->Export and change the extension to microsoft 16 bit wav PCM. There's a LOT of stuff you can do in audacity, and in a general way, Audacity is to Sony Acid Pro 7 as GIMP is to Photoshop. Unfortunately, that's not quite accurate, as gimp does a lot more in comparison.

You can always not pay for programs...