Original Buchla Music Easels and their clones lack two features implemented on the current manufacture BUSA models – ability for the envelope to self cycle (auto repeat) and ability to switch the modulation oscillator between low frequency and audio frequency ranges. This is a PCB which implements both these functions for owners of original easels or recent clones.
The module has mounting holes for M3 screws, spaced to mount on standoffs fixed to the slider screw holes under the sequencer section of a 208r module. Nylon screws and standoffs, or insulating washers, should be used in the motherboard to avoid contact with traces running near to the holes.
Fitting instructions and a connection diagram can be found here.
Shipped in an antistatic card box inside a jiffy bag.