SQWAK BOX

Prototype breadboard version playing Anamanaguchi's 'Prom Night'
A pile of version 1 boards
Board inserted into a breadboard
Some rework carnage
Testing v1 on a breadboard
Version 2 compared with version 1. IIRC the only real changes were the removal of a resistor from the low-pass filter and the addition of a ground pin near the inputs.
Wiring the SQWAK BOX into an exisiting button. This was a prank we played on a friend.