Here is a new little instrument called Scuba Sequencer from Aj Gannon based on the Baby 10 Sequencer design. The circuit uses only a 555 Timer and a 4017 LED Sequencer IC. The device can supply control voltage to other sound generators like the Atari Punk Console in order to create repeatable patterns and melodies. The Scuba Sequencer is constructed in two parts. The tempo control and the Step LEDs housed by a transparent bubble case and the voltage controlling potentiometers are in a larger enclosure with an umbilical cord connecting the two.
More detailed Build photos here. Thanks Aj!