The SoundPAL is a tiny module that plays canned and custom sound sequences.  It is a completely self-contained module, including a microcontroller for generating the sounds and a small speaker for producing them.  You can easily interface with a BASIC Stamp and you can play sounds while the BASIC Stamp is busy with other tasks. 

Key Features:

• Autoplay feature allows you to play a pre-designated EEPROM sequence with only a power supply  
• Single-pin interface uses a simple serial protocol to define and initiate sound production  
• Custom tunes and effects are simple to program using musical notation instead of frequencies  
• Total audio range is 6½ octaves in four different tempos and four playing styles  
• Virtually goof-proof power sourcing makes it nearly impossible to connect wrong  
• Onboard EEPROM permits saving custom sound sequences for later playback 
• Power requirements: 3.3 to 5v
• Communication: Serial
• Dimensions: .944 x .787 x .314 in (24 x 20 x 8 mm)
• Operating temp range: -32 to +158 °F (-0 to +70 °C)

Application Ideas:

• Audible notifications
• Robot task completion