Universal Audio Astra Modulation Machine

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

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

Texture your tones with iconic Japanese bucket-brigade chorus/vibrato, circa 1976

Quickly access sounds with Live/Preset modes, and play with silent switching, preamp coloration, and true/buffered bypass^*

Explore the outer limits with legendary rackmount bucket‑brigade studio flanging/doubling

Download additional Phaser X90 and Dharma Trem 61 effects at product registration

Get all the heavenly goodness of 1960's tube-driven tremolo, direct from your favorite American guitar amps

Build your pedalboard around timeless UA design and robust craftsmanship, built to last decades