Universal Audio UAFX Astra Modulation Machine Effects Pedal - Cream

The Chorus Brigade effect meticulously recreates the famed analog chorus and vibrato unit from the 1970s. With controls for speed, depth, level and mode, you can dial in every nuance of this influential sound, from subtle shimmer to seasick sway. The Chorus Brigade's circuitry gives a dimensional, retro character that stands apart from sterile digital replicas.

Flanger/DBLR Bends Time and Space

The Flanger/DBLR effect captures analog sound in exacting detail, simulating its colorful, somewhat lo-fi bucket-brigade circuit. Tweak the speed, depth and intensity knobs to conjure anything from a subtle thickening effect to an otherworldly whoosh.

Trem 65 Delivers Opto Tremolo Warmth

Based on the beloved tremolo circuit in the American '60s amplifiers, the Trem 65 effect faithfully recreates their balanced, warm pulsations. Choose between sine or square wave modulation, and adjust the intensity and speed for tremolo that moves from barely perceptible to intensely pulsing. The Trem 65 gives single notes and chords alike a pleasing undulation that evokes vintage rock and roll.

UAFX 2.0 Firmware Update

Launching November 11, 2025, the UAFX 2.0 firmware update delivers a major performance upgrade to Universal Audio’s two-button pedals, unlocking deep MIDI integration, enhanced footswitch control and streamlined app connectivity. Players can now select from four new footswitch modes—Live/Preset AB, A/Bypass + B/Bypass (Tour Mode), A/B–C/D and Boost + Live/Preset—ideal for live "channel-switching" workflows. The update introduces 128 recallable presets via MIDI Program Change, real-time parameter control through MIDI CC messages and MIDI beat clock sync for time-based effects, including the Starlight Echo Station, Astra Modulation Machine, Galaxy ’74 Tape Echo & Reverb and Del-Verb Ambience Companion. Bluetooth connectivity has been rebuilt from the ground up for increased reliability, while a new wired USB connection enables direct app control from iOS or Android devices. USB MIDI support further enhances expression, preset switching and clock sync capabilities, making it easier than ever to integrate UAFX pedals into modern performance rigs. All updates are free and compatible exclusively with dual-footswitch UAFX models.

The flagship Astra Modulation Machine pedal establishes a new standard for faithful emulations of coveted analog effects, delivering a sonic authenticity that surpasses all other stompboxes. Featuring three legendary effects—the Chorus Brigade, Flanger/DBLR and Trem 65—it conjures the tones that shaped rock history. Operable in mono, dual mono and stereo modes, the Astra Modulation Machine lets you craft lush soundscapes in any configuration. With rugged construction, intuitive controls and preset capabilities, the Astra Modulation Machine gives you a portal to the past and a path to new discoveries.