Universal Audio Astra Modulation Machine Effect Pedal

Always wanted the sound of Universal Audio plug-ins at your feet? The UA Astra features their popular chorus, flanger, tremolo, and phaser effects.

The Astra Modulation Machine is a flagship, no-compromise guitar effect pedal that establishes a benchmark for classic modulation effects, with sonic authenticity far beyond all other stompboxes. The Astra Modulation Machine features 3 legendary effects, Stereo/Dual Mono operation, True Bypass with Silent Switching, an optional Buffered Bypass via software, Analog Dry-Through, and a Preset Mode to recall stored settings.

Chorus Brigade

Based on the classic CE-1, the Chorus Brigade tone emulates every inch of this legendary pedal, expertly capturing its legendary bucket-brigade circuit.


Perfectly emulates the prized MXR studio flanger's colorful, almost lo-fi-sounding "bucket-brigade" circuit - offering subtle thickening to whacked-out sci-fi effects.

Trem 65

Captures the balanced, warm tones of classic Fender blackface opto tube tremolo (called "Vibrato" on the amp).

Bonus X90 Phaser & Dharma Trem 61 effects

Based on the classic MXR "script" and "block" Phase 90 effects, plus a unique "Dharma" Dynamic Harmonic Tremolo tone - available free at pedal registration.


- Chorus Brigade Chorus & Vibrato modes
- Flanger / DBLR - Flanging & Doubling mode
- Trem 65 - Sine & Square modes
- Knob, Preset, and Tap + Preset modes
- True / Buffered Bypass
- FREE Phaser X90 and Dharma Trem 61 bonus effects at registration
- Unmatched sonic authenticity
- Rugged UA build quality
- True Bypass with Silent Switching
- Optional Buffered Bypass read more
- Preset mode
- Configurable footswitch operation (Starlight and Astra models)
- Optional Preamp coloration on select effects
- UAFX Control mobile app for iOS and Android expands your options, allowing you to switch bypass routing for effect trails and access additional footswitch modes for Starlight and Astra
- UAFX desktop app for macOS/Windows lets you update pedal firmware

Hear Universal Audio's pedals in action in our live demo:
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Dimensions and Weight in Packaging
Base Item
Shipping Weight: 1.75 lbs
Shipping Dimensions: 7 x 5 x 3 in
Manufacturer Part Number (MPN): GPM-ASTRA

For support or warranty questions, please contact the manufacturer:
Phone: 831-440-1176
Web: https://help.uaudio.com/

Reviewers gave this product an overall rating of 5 out of 5 stars. (1 ratings)
Submitted May 7, 2021 by a customer from yahoo.com

"Best classic everything in one!"

Overall: 5 out of 5 stars
(see rating details)
Verified Customer zZounds has verified that this reviewer made a purchase from us.
This pedal covers a lot of ground, built like a tank, great packaging...but most of all, just top shelf effects all built in one unit. Chorus, Flanger/Doubler, Tremolo all doing exactly what you expect but less noise than the old units. Very impressed with achieving my goal of the old blue face MXR!
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