Universal Audio UAFX Astra Modulation Stereo Effects Pedal

SKU: UAGPMASTRA MFR: GPM-ASTRA
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Key Features

  • Explore a universe of rich, vintage modulation effects with this stereo pedal.
  • Craft swirling chorus, flanging, and tremolo tones with unparalleled sound quality.
  • Achieve iconic sounds easily using the intuitive controls for live performances.
  • Enjoy versatile modulation effects, from subtle textures to wild, experimental soundscapes.
  • Built for durability, this compact pedal will be a reliable tool for years to come.
  • Easily switch between presets, unlocking a world of inspiring modulation textures.
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Universal Audio Astra Modulation Specifications

  • Inputs

    2x 1/4" TS (right input for stereo connections)

  • Outputs

    2x 1/4" TS (right output for stereo connections)
    USB Type-C for updates via computer

  • Controls

    Speed Knob
    Depth Knob
    Intensity Knob
    Shade Knob
    Shape Knob
    Mode Knob
    Mode Switch
    Store Switch
    A/B Switch
    On Footswitch
    Preset Footswitch

  • Power requirements

    Isolated 9VDC, center-negative, 400mA minimum (sold separately)

  • Dimensions (H x W x D)

    2.56 x 3.62 x 5.55" (6.5 x 9.2 x 14.1cm)

  • Weight

    1.24 lbs (567g)

  • UPC Code

    819937002861

Designed For Use With:

  • Guitar Pedal

Need Help?

For any questions about compatibility with this product, call us at 800-223-2500 or you can email us any time.

About Universal Audio Astra Modulation

Make your guitar sound come alive with the innovative UAFX Astra Modulation Stereo Effects Pedal. This high-quality and durable pedal is designed by Universal Audio, a brand renowned for its advanced audio equipment. The pedal offers a versatile stereo effect, providing a wider and more expansive sound compared to a mono effect pedal.

This advanced stereo modulation pedal is equipped with classic Chorus, Flanger, and Tremolo effects, along with a tap tempo feature. It also offers selectable true or buffered bypass operation via a mobile app. The Astra Modulation Machine is the result of Universal Audio's engineers meticulously studying analog modulation effects to deliver the most authentic sounding bucket-brigade chorus/vibrato, studio flanger/doubler, and tube-driven tremolo ever incorporated into a stompbox.

Built on the powerful UAFX dual-engine processing, this pedal delivers unmatched levels of analog realism. The Astra Modulation Machine is designed to inspire with its richly addictive vintage modulation sounds. It perfectly emulates the circuit of the legendary gray bucket-brigade chorus stompbox, including its preamp section, to deliver authentically rich, saturated sounds.

The Astra Modulation Machine also features a Flanger/Doubler effect, capturing all the original qualities of the ultra-rare unit, and putting dense, complex flanging/doubling right at your feet. The Trem 65 effect is a faithful emulation of the optical tube-driven tremolo of '60s American amplifiers, capturing every detail down to the complex interactions between the light source photoresistor and 12AT7 driver tube.

The UAFX engine powers separate stereo instances of each modulation effect, thanks to its unique dual-engine processing. This is akin to having two bucket-brigade hardware units running simultaneously, providing a full stereo spread of complex, jaw-dropping textures.

The Astra Modulation Machine is a state-of-the-art stompbox, boasting modern, high-powered features like studio-grade conversion, dual processing engines, Live/Preset modes, plus selectable true or buffered bypass and tap tempo footswitch mode via the UAFX Control app. This pedal is designed to help you create your own sonic masterpiece. Please note that the Astra Modulation Machine requires a modern 400 mA isolated power supply, which is sold separately.

Universal Audio Astra Modulation 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
  • Stem-to-stern model of tube-driven optical tremolo from classic '60s American amps
  • Silent switching, Preset footswitch mode to store and recall your favorite setting
  • UAFX Control mobile app lets you to switch between true and buffered bypass and access Preset + Tap footswitch mode for time-synced effects
  • Free Phaser X90 and Dharma Trem 61 effects with registration

Product Documents

User Manual

Key Features

  • Explore a universe of rich, vintage modulation effects with this stereo pedal.
  • Craft swirling chorus, flanging, and tremolo tones with unparalleled sound quality.
  • Achieve iconic sounds easily using the intuitive controls for live performances.
  • Enjoy versatile modulation effects, from subtle textures to wild, experimental soundscapes.
  • Built for durability, this compact pedal will be a reliable tool for years to come.
  • Easily switch between presets, unlocking a world of inspiring modulation textures.

What's in the box:

  • Universal Audio UAFX Astra Modulation Stereo Effects Pedal
  • (Power Supply Not Included)
  • Universal Audio 1 Year Limited Warranty