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Universal Audio UAFX Astra Modulation Machine Pedal

A Trio of Timeless Modulation Effects

£319.00 £349.00
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stock availability
1 at our Guildford Store
1 at our off-site Warehouse
Want to Click and Collect or try items at our Guildford Store?

The store is open 10am - 6pm Monday to Saturday and 11am - 5pm Sunday and bank holidays.

The stock information shows the quantity of units that are available to purchase at the Guildford store and the quantity of units that are available at our off-site Guildford warehouse. These stock levels are updated in real time.

Our Click and Collect service is available at our Guildford store from 10am - 6pm Monday to Saturday, and 11am - 5pm on Sunday. You can either choose click and collect as your delivery option online or, during store opening hours, call our sales team at 01483 456777 to place a 10% deposit.

If you have placed your order online, you will receive a confirmation email of your order and a separate follow-up text or email to confirm when your item is ready for collection.

Please do not come to the store before you have received the follow-up message, as your order may not yet be ready at the store.

If the only available stock is in our off-site warehouse it can be brought to the store location for you to try - you just need to contact the store within opening hours. Please note any requests received after 3.30pm will not arrive at the store until the following morning.

Please be aware that, unless you have paid a deposit to reserve the item, it will continue to be free, both online and in-store, for another customer to buy. Therefore we would advise you to place a 10% deposit by either using the on-line click and collect service or calling us 01483 456777.


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Product Description

Music hardware/software specialists Universal Audio have taken their first step into the world of effects pedals. Years in the making, UA now brings the same class-leading innovation and ease-of-use of its acclaimed pro audio products to a tactile, pedalboard-friendly, plug-and-play stompbox format with gorgeous retro styling — aptly-named UAFX.

Boasting powerful dual-processor architecture, Universal Audio's cutting-edge UAFX pedals deliver multiple iconic and vintage-inspired sounds suitable for guitars or synthesizers. Sophisticated yet straightforward control panels allow you to precisely sculpt their superbly-detailed algorithms to perfection — sure to appeal to both audiophiles and home hobbyists alike.

The UAFX Astra is a Stereo modulation pedal with classic Chorus, Flanger, and Tremolo effects, tap tempo, and selectable true or buffered bypass operation via UAFX mobile app

Key Features

  • Flagship modulation pedal with powerful dual-processor UAFX engine.
  • Three timeless modulation effects, with secondary modes and settings.
  • Simple 'Live' and 'Preset' modes for instant recall of your favourite sound.
  • Additional downloadable effects by the world-renowned UAD algorithm team.
  • End-to-end emulation of iconic Japanese chorus/vibrato pedal.
  • True or buffered bypass*, silent switching.
  • Analog dry-through, stereo/dual mono operation.
  • Free Phaser X90 and Dharma Trem 61 effects with registration.
  • Classic UA analog design and robust craftsmanship, built to last decades.
  • UAFX Control mobile app lets you to switch between true and buffered bypassand access Preset + Tap footswitch mode for time-synced effects.

Astra Modulation Machine

Astra Modulation Machine is a complete sonic workstation. From the spacey studio flanger sounds of the '70s, to gritty bucket-brigade chorus, and luscious opto tube tremolo — Astra puts three stunningly-emulated modulation effects right at your feet. 'Chorus Brigade', 'Flanger DBLR' and 'Trem 65' settings, with secondary modes for 'Vibrato', 'Doubling' and more, combine for an abundance of tasteful tone tweaking.


  • Chorus Brigade: Classic ‘70s analog bucket brigade chorus with additional 'Vibrato' mode.
  • Flanger/DBLR: Studio flanger/doubler tones modelling legendary rack effects units.
  • Trem 65: Perfectly-emulated opto tube tremolo derived from iconic blackface amps of the mid-1960s.
  • Bonus Effects: Free 'Phaser X90' and 'Dharma Trem 61', downloadable at registration.

Additional UAFX Appointments

Further UAFX features include intuitive 'Preset'/'Live' modes for instant recall of your favourite sounds, analog dry-through circuitry, super-wide stereo/dual mono operation, true bypass with silent switching, an 'Effect Mode' toggle switch that provides access to variations of each active effect type, free additional downloadable sounds from the adored UAD algorithm team and much more!

UAFX Control Mobile App

The UAFX Control mobile app lets you get even more out of your UAFX pedal, with switchable bypass options for effect trails and customisable footswitch modes. The app is available to download now for free, but be sure to update your pedal’s firmware first via the UAFX desktop app for macOS/Windows.


  • Power Requirements: Isolated 9VDC, centre-negative, 400mA minimum (PSU sold separately)
  • Inputs: 2 x ¼” TS (input 2 for stereo connections)
  • Outputs: 2 x ¼” TS (output 2 for stereo connections)
  • USB Type-C for updates via computer
  • Height: 2.56” (6.5 cm)
  • Width: 3.62” (9.2 cm)
  • Depth: 5.55” (14.1 cm)
  • Weight: 1.24 lbs (0.567 kg)