Pricing and availability
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Average Price: $599
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$149
$350+
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Based on price data from 1 merchant for "Buchla Easel AUX Expander". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.
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Description
The Buchla Easel AUX Expander is your gateway to a world of enhanced modular synthesis, designed for musicians who crave innovative sound exploration. This expander card is the perfect companion for your Buchla Music Easel, Easel Command, or 208C models crafted after 2012, transforming them into a versatile sonic powerhouse.
At the heart of the Easel AUX Expander is its modulation oscillator, which offers an impressive range of both low- and audio-frequency operations. Whether you need another modulation source or a new synth voice, this oscillator has you covered. Dive into a creative realm with four morphable waveforms, offering you the flexibility to shape and contour your sound with precision and nuance.
For those seeking to sculpt unique soundscapes, the onboard noise filter and mix control provide the tools you need to blend modulation and noise signals seamlessly. And with the Pulser feature, enjoy expanded sequencing and randomization capabilities, allowing you to infuse your compositions with dynamic variations.
The CV multiplier is a standout feature, introducing new dimensions of control and manipulation, enabling you to redefine how your synthesizer interacts within your Buchla ecosystem. With color-coded jacks, navigating the complex web of pulse, audio, and CV connections becomes a breeze, ensuring an uninterrupted creative workflow.
Key Features:
- Compatible with all Music Easel, Easel Command, and 208C models post-2012
- Dual-function modulation oscillator for low- and audio-range operations
- Four morphable waveforms for versatile sound shaping
- Onboard noise filter and mix control for texture crafting
- Pulser for sequencing, envelope, and randomization capabilities
- CV multiplier for expanded control possibilities
- Color-coded jacks for easy navigation and connectivity
Product specs
| Type | Auxiliary OSCillator Card v2 for Buchla Easels (post-2012) |
| Controls | Source Switch, Pulse Destination Switch, Multiplier Knob |
| Oscillator | Modulation Oscillator |
| Waveforms | Sin, Sawtooth, Pulse, Square |
| Effects Types | CV Multipler, Switch Control |
| Analog Inputs | 1 x 3.58mm (pulse), 2 x 3.58mm (A, B), 1 x 3.58mm (osc freq) |
| Analog Outputs | 1 x 3.58mm (C), 1 x 3.58mm (osc) 1 x 1/8" (osc) |
| Other I/O | Wave, Mix, Noise Filter |
| CV Connector | Buchla Banana |
| Power Supply | Requires Buchla Easel/Easel Command |
FAQs
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What is the Buchla Easel AUX Expander used for?
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The Buchla Easel AUX Expander is designed to enhance the capabilities of Buchla Easels by adding an auxiliary oscillator with multiple waveforms and modulation options, providing more complex sound design possibilities.
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Is the Buchla Easel AUX Expander compatible with all Buchla Easels?
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The AUX Expander is compatible with Buchla Easels manufactured post-2012, making it important to verify your Easel's production year before purchasing.
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What waveforms does the Buchla Easel AUX Expander support?
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The Buchla Easel AUX Expander supports sine, sawtooth, pulse, and square waveforms, allowing for a diverse range of sound textures and modulation capabilities.
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How does the AUX Expander integrate with the Buchla Easel?
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The AUX Expander connects via Buchla Banana CV connectors and provides additional analog inputs and outputs, seamlessly integrating with the Easel to expand its sonic capabilities.
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Does the Buchla Easel AUX Expander require an external power supply?
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No, the AUX Expander draws power directly from the Buchla Easel or Easel Command, eliminating the need for an additional power source.
Videos
Analogue Zone Showroom / Synths and Studio
NAMM2017: Introducing Buchla Easel AUX Expander
Reviews
Owner Insights
We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Buchla Easel AUX Expander.
Features and functionality
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The 216 touch-controlled voltage source can drive a 258 dual oscillator, allowing each touch plate to select two pitches with pressure controlling volume.
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The Easel's five-step sequencer and preset voltage sources, combined with analog reverb and random voltage generator, offer unique melodic and atmospheric capabilities.
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Use cases and applications
User experience
Build quality
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Some Easels exhibit modulation oscillator bleed into the reverb tank, a common issue with a DIY fix available.
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Mods and upgrades
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A third-party toolbox enables access to hidden features like individual gate outputs for sequencer stages and CV control for oscillator parameters.
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Value and pricing
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A B-stock Easel might offer cost savings, but reliability and customer service issues have been reported.
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