Sounds bring your Spot to life. 3DML supports wav audio files which are popular in video games and on the web.

FREE WAV SOUNDS
There are hundreds of sites on the web offering seamless textures for walls and object textures for your spots.

grsites  sounds - 2000+ sounds for use in your Spots!
wavcentral.com - great source of wav sound libraries.
top 50 wav sites - more wav files than you can shake a stick at!

WAV EDITING TOOLS
Some free editing tools for wav audio.