Available as an assembled Module and as a DIY project.
No info about availability.
Analog Shift Register
The ANALOG SHIFT REGISTER (ASR) is a sequential sample and hold module for producing arabesque-like forms in musical space (see diagram). Whenever pulsed, the previously held voltage is sent down the line to three consecutive outputs to produce the electrical equivalent of a canonic musical structure. A pulse output permits linking two or more Analog Shift Registers together to form longer patterns.
These merchants probably sell this module. Huh?