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.
I'll update this as I do the mods.
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
If someone out there finds the schematics could you please send me the link.
Maybe Korg will make them available over time.
You will need to remove the battery compartment to fit the program card into the case.
This appears to be the point:
These are my first patch points:
Orange: Sync in.
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.
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.
The six 100k resistors are the inputs .
generator (green) CV outputs .
Fitting the mixer into such a small box proved a challenge.
DC mixer (CGS 04).
The mixer is being used for the 6 audio outs (3 from each VCO).
It seemed that the outputs were feeding back into the circuit so I added some diodes.
As I went along I discovered that the VCO, Filter and VCA outputs marked on the PBC also worked
quite nicely as modulation inputs.... So I decided to use these instead on the filter cutoff & peak inputs I marked out earlier (see above). Is this a mistake of the manufacturer? Are the outputs really inputs?
+ Ken Stone's DC mixer (CGS 04)
To be continued.