Taking you deep down the rabbit hole of classic analog modulation, the UAFX Astra Modulation Machine delivers the most sonically authentic bucket-brigade chorus/vibrato, studio flanger/doubler, and tube-driven tremolo effects ever combined into a single stompbox.

Built on our powerful new UAFX dual-engine processing and unmatched levels of quirky analog realism, Astra offers richly addictive vintage modulation, beautifully crafted to inspire you for decades.

• Texture your tones with iconic Japanese bucket-brigade chorus/vibrato from around 1976
• Explore the outer limits with the legendary rackmount bucket-brigade studio flanging/doubling
• Get all the heavenly goodness of 1960s tube-driven tremolo, straight from your favorite American guitar amps
• Quickly access sounds with Live/Preset modes, and enjoy silent switching, preamp coloration, and true/buffered bypass*
• Download additional Phaser X90 and Dharma Trem 61 effects upon product registration
• Build your pedalboard around timeless UA design and robust craftsmanship, built to last for decades

Chorus Brigade: Iconic Japanese Modulation
When it was released in 1976, this legendary gray bucket-brigade stompbox changed the sound of music with its thick, luxurious chorus and wavy vibrato. Astra's Brigade Chorus mode gives you the most complete circuit emulation of this landmark unit — including its preamp section for authentically thick, saturated sounds — letting you paint with subtle ripples of analog texture and tone, adding chewiness, shimmer, and motion to everything you play.

Flanger/Doubler: A Rackmount Studio Classic
Packed with late-’70s bucket-brigade technology, this classic rackmount studio flanger/doubler is famous for stunning whoosh effects, organic thickening, and a parade of wild sounds that go far beyond typical flanger pedals. Astra’s Flanger/Dblr effect is the only end-to-end circuit emulation of this ultra-rare unit, capturing its original features perfectly and putting impossibly dense, complex flanging/doubling right at your feet.

Trem 65: Authentic Tube Amp “Shake”
Few things compare to the optical tube-driven tremolo of ’60s American amplifiers. Deep, undulating, and the very essence of vibe, Trem 65 is a faithful emulation of this classic circuit. From shimmering ripples to choppy mayhem, every dynamic detail is captured in UA style, down to the complex interactions between the light source photoresistor and 12AT7 driver tube. Plus, you can explore further and create your own tremolo textures with variable sine and square wave settings.

Dual Stereo Modulation Engines for Endless Creativity
Astra’s UAFX engine powers separate stereo instances of each modulation effect, thanks to its unique dual-engine processing. It’s like having two bucket-brigade hardware units running simultaneously — or even dual tremolo circuits — giving you a full stereo spread of complex, jaw-dropping textures.

A State-of-the-Art Stompbox
With modern, high-powered features like studio-grade conversion, dual-processing engines, additional downloadable effects at registration, Live/Preset modes, true/buffered bypass,* and silent switching, the Astra Modulation Machine has your colors — now go forth and paint your masterpiece.

Features

Flagship, no-compromise stompbox offering the most authentic bucket-brigade and tube-driven tremolo effects ever captured in an effects pedal

End-to-end emulation of iconic Japanese chorus/vibrato pedal

Complete circuit capture of legendary ’70s rackmount studio flanger/doubler

Full model of tube-driven optical tremolo from classic ’60s American amps

Store and recall your favorite presets, silent switching, and true/buffered bypass*

Free Phaser X90 and Dharma Trem ’61 effects, downloadable at registration