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Tiptop AudioBuchla 281t Quad Function Generator


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Tiptop Audio Buchla 281t

Bringing forth a classic and revolutionary module to the Eurorack world, Tiptop Audio's Buchla series Quad Function Generator Model 281t is a recreation of the famed 200 Series module. Inspiring sound design and electronic music, the Buchla 200 series brought forth many modules for shaping and synthesizing tones and noise, and the 281t recreates a quintessential envelope/LFO and implements full Eurorack CV I/O by replacing the banana jacks with 3.5mm TS jacks. Each function generator can act independently as well as in pairs via Quadrature mode—triggering and balancing two generator outputs with each function shifted 90 degrees out of phase for creating complex modulation sources ideal for quadrophonic movement.

Determine the rate at which the function rises and falls with the Attack and Decay parameters, respectively, each with voltage control over times spanning one millisecond all the way to ten seconds. Each function can be triggered via the manual trig button or via their trig inputs, with three different modes of operation per function generator. Cyclic mode will cycle the function continuously for LFO-like behavior, while Transient and Sustained modes act as conventional Attack/Decay and Attack/Sustain/Release envelope generators, respectively. Introducing a gate atthe cycle input will activate cycling in any mode, allowing you to inject moments of looped modulation.

Each generator has a dedicated output for shaping your audio and modulation signals, and additionally, each generator's end of decay will also send out a trigger pulse—great for introducing triggered or clocked signals to other modules or even self-patched modulation! Offering a timeless modulation source in much more accessible format for today's synthesists, the Tiptop Audio Buchla Quad Function Generator 281t provides loads of functionality for any Eurorack system.

Buchla 281t Features

  • Faithful revival of the Buchla Quad Function Generator Model 281 in Eurorack format
  • Formatted for Eurorack height in a longer module, with minimal adjustment to functionality
  • Four identical function generators to produce envelopes and LFOs
  • Entire unit sends and receives Eurorack level signals via standard 3.5mm jacks
  • Attack and decay times both range from 1ms to 10 sec, each with CV input (longer times available via external CV)
  • Trigger button and input activate the function generator
  • Mode switch determines how function generator acts to triggers and gates (Cyclic, Transient, and Sustained)
  • Cycle CV input enables and gates cycling
  • Per channel function generator output and end of decay trigger output
  • Quadrature mode to enable paired generators with functions shifted by 90 degrees of each other
  • Adjustable analog OR functionality for creating complex envelope shapes
  • Eurorack module
  • Width: 28hp
  • Depth: 32mm
  • Current draw: 160mA @ +12V, 55mA @ -12V
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Product Demo Videos
Buchla & Tiptop Audio - Series 200
The Buchla analog modular synthesizer has been around since the early 1970s yet very few people ever had a chance to play one or even to see one in person. Buchla and Tiptop Audio have joined forces to resume the production of these wonderful rare pieces of gear.
Buchla & Tip-Top Audio : Classic Noise : 258t Dual Oscillator and 281t Quad FUNction Generator
Our pal Wes plays around with the brand new Eurorack versions of the 258 and 281, two of Buchla's 200 series foundational modules. These wonderful recreations have a lot of history behind them, so lets take a listen to some classic west coast sounds, and patch examples.
Tiptop Audio Buchla 281t Quad Function Generator Reviews