Explore Classic Chorus, Flanging/Doubling, and Tube Tremolo Effects

Built upon our powerful UAFX dual-engine processing and unmatched levels of quirky analog realism, Astra takes you deep down the rabbit hole of classic analog modulation, giving you the most sonically authentic bucket-brigade chorus/vibrato, studio flanger/doubler, and tube-driven tremolo effects ever placed into a single stompbox.

Create with Iconic Japanese Modulation

Upon its release in 1976, this legendary gray bucket-brigade stompbox changed the sound of music with its thick, luxuriant 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.

Explore the pinnacle of classic chorus, flanging/doubling, and tube tremolo effects.

• Texture your tones with iconic Japanese bucket-brigade chorus/vibrato, circa 1976
• Explore the outer limits with legendary rackmount bucket‑brigade studio flanging/doubling
• Get all the heavenly goodness of 1960's tube-driven tremolo, direct from your favorite American guitar amps
• Get realtime MIDI control of effects parameters*, improved Bluetooth and hardwired connections, and more using updated UAFX Control app
• Quickly access sounds with Live/Preset modes, and play with silent switching, preamp coloration, and true/buffered bypass
• Download additional Phaser X90 and Dharma Trem 61 effects at product registration
• Build your pedalboard around timeless UA design and robust craftsmanship, built to last decades

• 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
• Stem-to-stern model of tube-driven optical tremolo from classic '60s American amps
• Supports MIDI-over-USB*, improved Bluetooth and hardwired connections, and more via the updated UAFX Control app
• Store and recall your favorite preset, silent switching, and true/buffered bypass*
• Free Phaser X90 and Dharma Trem '61 effects, downloadable at registration