The Buchla 156 is a very early example of a CV processor .... possibly the earliest.
It was developed to enable more flexibility in the
Buchla 100 system.
Most of the early 100 modules (such as the Buchla 158 VCO) didn't have a any way to attenuate /offset voltages entering their often single CV inputs.
So the 156 was developed to do this.
In the later 200 series Buchla added CV processors into modules like the 258 VCO. (see pics below)
As Buchla evolved, new CV processor modules were invented such as the 256, 257 & the Verbos 254v but the 156 is the grand daddy of them all.
The module consists of two independent CV processors.... left (A) & right (B).
Left CV processor (A)
The left CV processor has two inputs. They feed into a mixer (bottom knob) .
The centre knob (offset) adds a + voltage
offset to the input (0V-15V range).
If you are using this in a 200 system the voltages will probably be in the range of 0-10V.
The top knob mixes between the external signals and the internal voltage offset .
The output is at the top
Right CV processor (B)
The right processor is similar to the left one except it has one inverting input.
Buchla 158 & 144 VCOs
didn't have many CV inputs so the 156 was useful in manipulating CV voltages from keyboards and sequencers before they touched the VCO.
The 258 incorporated CV processing circuits into the module.
other Buchla CV processors:
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