According to guyd2, the Model 416.3 Meta Expander is:
"A sophisticated, stand-alone expansion unit for the Buchla Music Easel.
Contains several dedicated modules : Comparators, Dividers, Boolean, VC Slew Limiter, S/H & Noise, analog ultrastable VCO/LFO, advanced Mixer w/ Comparator, and an 8-step Sequencer.
Also expands on the 208 CV I/O's, pulses I/O and Switch inputs."
https://guyd2.com/416_3-order/
"What you get :
- Model 416.3 Meta Expander for Bemi/Busa/Buchla Easel, 208c, or clones.
- Custom-made enclosure (boat) + tilted support stand.
- Two Model 416 Edge Cards, 100% compatible with 208’s Ext/Prog Interface.
- Two 40-pin custom-made ribbon cable assemblies (one short, one longer).
- A printed User Manual.
- Internal power supply; its location (back or right-side) is adjustable by the user."
