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Tiptop Audio Buchla Model 257t Dual Voltage Processor Module

Recreation of the Buchla 200-series 257 in Eurorack format featuring two multi-processor channels to introduce, control, and modulate voltage

MFR# 257t Dual Voltage Processor

Product Description

The Tiptop Audio Buchla Model 257t Dual Voltage Processor Module is an authentic replica of a classic CV processor in Eurorack format. Adding to TipTop Audio and Buchla's collaboration recreating famous 200 series modules for Eurorack, the 257 provides the same magic as the original. It features two channels of three different voltage processing tools making it ideal as a voltage source, sound shaping tool, and performance device.

Though it may seem complicated, the 257t essentially consists of two sections - top and bottom - both of which contain three voltage processing functions including an attenuverter, CV-controllable crossfader, and offset generator. Each of these three processes is summed together, creating a wide variety of utility voltage processing functions.

The attenuverter is used for scaling and inverting external CV. The voltage-controllable crossfader optimized for use mixing control voltages. You can use it to proportionally balance between two CV signals and adjust the proportional balance with an incoming control voltage. With only one input you can use the CV input like a rudimentary VCA. The left channel of the crossfader features a button to internally connect a +5V offset signal providing simplified and unusual ways of signal scaling/inversion when modulating the crossfader. The simple but tunable 10V offset is ideal for introducing negative signals into the positive or even balancing voltage range you want your signal to affect.

These are all summed at the end for a highly-definable output. You can double the complexity of this processor by routing the first to the second. Essential for a Eurorack rig, the Model 257t brings unparalleled control to your Eurorack system.


  • Dual voltage processor module
  • Recreation of the Buchla 200-series 257 in Eurorack format
  • Two multi-processor channels to introduce, control, and modulate voltage
  • Attenuverter that can dial in control voltage positively or negatively
  • Middle section adds and mixes between two inputs, acting like a crude CV crossfader/VCA
  • Second input can be an offset of 5V to balance against
  • Right section features a voltage offset up to 10V
  • Final output voltage is a summation of all the three voltage processors

Product Specifications

Condition New
Depth 25 mm
Chassis Module
Module Type Eurorack
Module Slot Count 14hp
Connector Type 3.5 mm
Power Consumption 45 mA +12V; 22 mA -12V; 0 mA 5V

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