Available as an assembled Module and as a DIY project.
This Module is currently available.
Expander for Popcorn sequencer module
POPCORN CV EXPANDER
adds more CV inputs for enhanced control of nonlinear browsing thru the steps
Features
gate input for selecting minor or major setting of the quantizer
CV input for Gate Time
CV input for Slide Time
CV input for how many steps are jumped by trigger A
CV step address offset
alternative mode when 3 of the CV inputs acts as 3 binary gate bits to select the step address (instead of Gate & Slide time and trigger A steps)
technical details
2HP width
connects to popcorn sequencer
note: It doesn't have it's own power supply but it draws 5V power from the master module
http://noise.kitchen/shop/bastl/bastl-instruments-popcorn-cv-exp-copy/
These merchants probably sell this module. Huh?