Ronan Fed RF-AB303 v1.1 VST VST3 WiN [FREE]

Ronan Fed RF-AB303 is a free monophonic bass synth for Windows, built for acid lines inspired by the Roland TB-303. Its single-oscillator design pairs filtering with onboard effects, giving hobby producers a focused instrument for classic Acid House, Techno and Trance patterns.

RF-AB303 supports straightforward step programming within your DAW, so you can build intricate bass sequences rather than rely only on sustained notes. The effects section includes parametric EQ, distortion, compression, delay and reverb, allowing you to shape the bass tone and add space without immediately reaching for separate processors.

Version 1.1 expands the available controls with Filter Attack, an additional high-pass control, Amp Hold Time and Delay Feedback. It also adds more presets, revises the interface and fixes the Slide Learn menu.

Available in VST and VST3 formats, RF-AB303 suits Windows-based setups using compatible hosts such as FL Studio and Ableton Live. It is a practical choice for producers exploring 303-style bass programming or adding acid sequences to electronic tracks.