Universal Audio UAFX Flow Vintage Tremolo Effects Pedal

Born from the flagship Astra Modulation Machine, the Flow Vintage Tremolo brings you three distinct flavors of tube-driven wobble and shake — ranging from classic to contemporary — all in a sleek, compact design.

Dive into the rich, chewy throb of early '60s American "brown" amps, combining smooth volume fluctuation with phase shifting that goes well beyond the original circuit, perfect for vintage soul, surf, and even Uni-Vibe tones.

Experience a comprehensive emulation of a classic 1965 American tube amp’s optical tremolo circuit, delivering that signature pulsating shimmer — the same "vibrato" sound made famous by legendary records.

Engineered with UA’s proprietary virtual optical photocell, this pedal offers the organic movement of square waveforms and rhythmic trem effects that seamlessly fit into any genre, from modern pop and R&B to blues and indie rock.

Flow captures the warm, complex character of a tube preamp — specifically from early and mid-'60s American combo amps — ensuring your tremolo effects sound rich, three-dimensional, and musical.

Built for reliable, long-lasting performance, the Flow Vintage Tremolo features switchable true/trails bypass, tap tempo, and a "make-up gain" volume control, so your tremolo effects are always heard loud, clear, and full of life for years to come.

Features

• Authentic emulations of three tube-driven tremolo effects, captured in a compact stompbox
• Perfectly captured tube preamp for fat, three-dimensional tremolo tones
• Three tremolo modes: Dharma (harmonic tremolo), 65 (round, sine wave), and Square (choppier, square wave)
• Onboard tap tempo for syncing trem effects
• Volume control and true/buffered bypass
• Timeless UA design and craftsmanship, built for decades of dependable performance
• Power requirements: Isolated 9VDC, centre-negative, 250mA minimum (sold separately)
• Inputs: 1 x 1/4” TS unbalanced
• Outputs: 1 x 1/4” TS unbalanced
• USB Type-C for updates via computer
• Height: 5.81 cm, 2.29 inches
• Width: 6.55 cm, 2.58 inches
• Depth: 12.07 cm, 4.75 inches
• Weight: 0.659 lbs (0.299 kg)