I built the Micro Casket in November 2007 for my friend Nick Speak's
40th birthday. The circuits came from 3 of those musical birthday
cards. The first plays the ET theme, the second plays "Superfreak", and
the third plays "Macho Man". All three circuits were declocked, and are
now controlled by touching the metal things on the top part. The knob
just
controls the volume to the output.