Buchlaized Korg Volca Bass

Some notes regarding incorporating a Korg Volca Bass into a Buchla 208 easel.
The aim is that the Easel's patch card provides all power, sync & CVs for the volca bass.
This is a progression from my earlier attempt of buchlaizing a Korg monotron Duo.


Open from the back.

 Korg has as with the monotron labelled patch points.
VCO out, VCA out & VCF out.
Plus there are the outs for the Saw & square waves for all 3 VCOs

A close up.


You will need to remove the battery compartment to fit the program card into the case.
And how do you sync both sequencers.???
This appears to be the point:
For it to work you need to fool the volca into thinking you have plugged in a sync cable.

These are my first patch points:
From left to right,
Orange: Sync in.
Blue: Ground
Red: filter (cut off) modulation in.
Green: Filter (Peak) mod in.

The filter cutoff seems to like the 208's random & envelope CVs.
The peak responds ok to the Envelope. Need to do more tests.
Fitting the card into the volca case .... very tight. Needed to remove pretty much everything including the speaker.... not a major loss.

The 4 resistors in the top left are simple voltage dividers.
The volca syncs nicely to 5V pulses and the Buchla outputs 10V pulses.
Though both sequencers do sync, the volca runs at twice the speed of the 208's sequencer.
One solution is to set the 208 to a 4 step sequence and use the 1st & 3rd pluses to clock the volca.
To be continued.
J