Universal Audio UAFX Astra Modulation Pedal

Three Classic Modulations United in the UAFX Range

The Astra Modulation Machine condenses Universal Audio's approach: recreating the character of iconic analog modulations that defined decades of recordings, from 1970s studio flangers to Bucket-Brigade chorus technology, not to mention the tube optical tremolo typical of 1960s American amps. Within the UAFX range, the Astra positions itself as a high-end solution designed for guitarists seeking "record-ready" sounds, with an organic response and details usually associated with studio gear.

As a bonus, the pedal provides access to additional effects Phaser X90 and Dharma Trem 61 available after product registration, expanding the modulation palette without changing your pedalboard.

Who the Astra Is For: From Minimalist Pedalboards to Stereo Setups

This pedal is aimed at guitarists (and keyboardists) who want expressive and musical modulation rather than a complex multi-effects unit: a chorus that thickens without drowning, a flanger that remains elegant, and a tremolo that breathes like a tube amp. It suits intermediate musicians seeking instantly inspiring tones as well as professionals demanding stable, silent, and consistent modulation from gig to gig.

In practice, the Astra excels in blues, pop, rock, funk, indie, shoegaze, and ambient styles. Its value becomes even clearer in stereo: width, movement, and depth for two-amp rigs, wet/dry setups, or direct integration into a studio chain.

Controls, Modes, and Design: Made for Playing, Not Navigating

The Astra offers three timeless modulation effects with settings and secondary modes to refine the texture. The Chorus Brigade mode reproduces the thickness and shimmer of a Japanese-style Bucket-Brigade chorus, including the behavior of the preamp to capture the slight saturation and grain that make the sound lively. The Flanger/Doubler ranges from spectacular "whoosh" effects to subtle doubling that naturally thickens, with complex tones that go beyond traditional flangers. Finally, the Trem 65 recreates the tube optical tremolo, with the option to explore different waveforms (sine and square) to shift from silky shimmer to sharper pulses.

On stage, the Live/Preset duo is a real comfort gain: you switch between settings without breaking your flow. For integration, you choose between true bypass or buffer depending on cable length and pedalboard complexity, all while enjoying silent switching. Lastly, the USB-C connection allows firmware updates from a computer, keeping the pedal up to date and granting access to compatible content.

Sound Characteristics

The Astra aims for dense, three-dimensional modulation with a very "analog" feel, featuring natural movement that respects attack and sustain. The chorus can range from simple textured brightness to a lush effect, perfect for widening arpeggios, adding warmth to a clean tone, or thickening a crunch. The flanger/doubler stands out for its ability to remain musical: you get as much depth as oddness without losing note clarity. As for the tremolo, it delivers an organic and lively pulse, especially convincing on open chords, syncopated riffs, or surf/retro atmospheres, with dynamic response that follows your pick nuances.

Technical specifications

Effects	Tremolo, Chorus / Flanger / Phaser, Chorus	Use	electric guitar
Format	Pedal	Color	Beige
Type	sector

Bonus effects	Phaser X90 and Dharma Trem 61 (available upon pedal registration)	Outputs	2 TS 6.35mm jacks (Output 2 for stereo connections)
Inputs	2 TS 6.35mm jacks (Input 2 for stereo connections)	Power supply	9 V DC shielded, center negative, minimum 400 mA (not included)