The “Sequence of Events” programmer panel consist of the following modules:
Gate Sequencer
Discrete Programmable Sequencer (4 stage)
Bi-Directional Router
Discrete Programmable Sequencer (4 stage)
Sequential Switch
Dual Slopes Compact

https://www.low-gain.com/shop/p/sequence-of-events

Available as an assembled Module and as a DIY project.

This Module is currently available.