Tiptop Audio / Buchla 257t Dual Voltage Processor

The algebraic operations possible with the Model 257 Dual Control Voltage Processor are addition, subtraction, scaling, inversion, and multiplication. It also incorporates the ability to crossfade between two input CVs using CVs.

The Model 257 Dual Control Voltage Processor consists of two identical CV processors, each outputting a CV according to the following equation. The voltage value of this CV is determined by the input multiple CV voltage values and the three knob settings.

(Va x K) + ((Vb x (1-M)) + (Vc x M)) + V offset = V_out

The algebraic operations possible in this module are addition, subtraction, scaling, inversion, and multiplication. It also incorporates the ability to crossfade between two input CVs using CVs.

■Functions
■Attenuator.
The [Va Input] pin (far left on the panel) is the CV input to the [K] knob (attenuator).
The [K] knob can scale the CV (Va voltage) input to the [Va] terminal to a positive (plus) or negative (minus) value.

■Cross Fader
The [Vb Input] jack (second from the left on the panel) is the input to the left side of the crossfader.
The [+. 5] switch adds 5V to the CV (Vb voltage) input to the [Vb] jack.
The [Vc Input] jack (4th from left) is the input to the right side of the crossfader.
-M scales the Vb voltage from 1 to 0 according to the position of the [M] knob.
M scales the Vc voltage from 0 to 1 according to the position of the [M] knob.
The [-M/M/M Input] pin (third from the left = center of the panel) can crossfade between the Vb and Vc voltages.
The position of the [M] knob and the voltage input to the -M/M Input are added to control the crossfade position.

■Offset.
Turn the [V offset] knob to add 0 to 10 V to any combination of Va voltage + Vb voltage + Vc voltage.

■Output
The [Vout ] pin (right end of the panel) is the voltage of the attenuator, the crossfader voltage, and the offset voltage, all added together.

About Buchla & Tiptop Audio's "Eurorack 200 Series
The Eurorack 200 series results from a collaboration between Tiptop Audio and Buchla, the legendary synthesizer manufacturer on the West Coast of the United States. The 200 Series, a rare modular synthesizer developed almost half a century ago, has been reproduced in the Eurorack format. Bringing the quintessential Buchla modules of West Coast style synthesis to today's many modular players, the Eurorack 200 Series will get a West Coast flair to your modular system.

Width: 14HP
Depth: 25mm
Current consumption:
+12V : 45mA
-12V : 22mA