Available as an assembled Module and as a DIY project.
No info about availability.
Analog Shift Register - a sequential sample and hold with 3 outputs
Circuit/PCB by David Dixon; panel and assembly by Sduck (Stephen Drake)
Included in 4 Racks, 2 are public:
Nonlinear Circuits - Nonlinearcircuits
Elby Designs CGS734 Analog Shift
Doepfer A-152 Voltage Addressed Track &
VAEMA Shift Register