SoundPAL

http://www.parallax.com/Portals/0/Downloads/docs/prod/robo/SoundPAL...
The SoundPAL is a tiny module that plays canned and custom sound sequences. It is completely self-contained, including a microcontroller for generating the sounds and a small speaker for producing them. The SoundPAL interfaces easily to a BASIC Stamp and can play sounds while the BASIC Stamp is busy with other chores.