The chip generates a number of PWM LFO waveforms that can be used in stompboxes and synth applications. Here is a link to the datasheet:
V2D is an update to fix a possible timing problem which will stack due to some calculation errors. The above link explains the details.
Here is a link to the build information for Taylor Livingston's popular Tap Tempo Tremolo: http://www.aronnelson.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=43017