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DW-303 is a free, open-source TB-303-style bass synthesizer featuring circuit-modeled sound generation, a 16-step sequencer, 64 patterns and support for multiple plugin formats and operating systems.

UK-based DJW Audio has released DW-303, a free, open-source bass synthesizer and step sequencer modeled on the classic Roland TB-303.

The software recreates the original instrument’s oscillator, filter, envelope and amplifier circuitry through component-level modeling, with versions available for macOS, Windows and Linux.

Rather than using a conventional virtual-analog synthesis architecture, DW-303 models the TB-303 signal path stage by stage using the original circuit schematic. The developer says the models were subsequently fitted against measurements of hardware, including the behavior of the filter resonance, accent and slide circuits.

The synthesizer includes sawtooth and square waveforms, a resonant ladder filter and controls for cutoff frequency, resonance, envelope modulation, decay and accent. A Full quality mode performs the complete circuit simulation, while an Economy mode offers a lighter processing option.

DW-303 also recreates the TB-303’s characteristic 16-step programming workflow. Notes are entered in pitch mode, followed by rhythmic programming in time mode, with individual steps supporting notes, ties, rests, accents, slides and transposition.

Features:

• Stage-by-stage circuit modeling of the oscillator, ladder filter, envelopes and VCA.
• Sawtooth and square oscillator waveforms.
• Resonant ladder filter with adjustable cutoff and resonance.
• Filter envelope with adjustable envelope modulation and decay.
• Accent circuitry with interaction between resonance and filter modulation.
• 16-step sequencer with separate pitch and time programming modes.
• 64 patterns organized into four groups, each with A and B sections.
• Seven tracks for chaining patterns into longer arrangements.
• Per-step accent, slide and transpose controls.
• Internal, MIDI clock and DAW host synchronization.
• MIDI keyboard input with last-note priority, portamento-style slides and velocity-controlled accent.
• Full and Economy circuit simulation quality modes.
• Factory patterns included.

DW-303 supports VST3, AU, AAX, CLAP and LV2 plugin formats, depending on operating system, as well as standalone operation. When synchronized to a DAW host, its sequencer follows the host tempo and transport, with patterns saved as part of the project session.

DJW Audio DW-303 is available free of charge for macOS 11 or later, Windows 10/11 and Linux x86_64. No license key or activation is required. The source code is available under the GPL-3.0-or-later license. Visit the official DW-303 product page for downloads and installation information, or visit the GitHub repository for the source code.

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Eric Whitacre Eternity combines recordings of analog synthesizers, a historic family piano and heavily processed choir with more than 200 presets, dual-layer sound design and effects drawn from Whitacre’s own studio setup.

Spitfire Audio has released Eric Whitacre Eternity, a virtual instrument library combining analog synthesizers, processed choir recordings and piano samples drawn from the Grammy-winning composer’s latest musical project.

Developed alongside Whitacre’s album Eternity in an Hour, the library captures the electronic and acoustic sound sources used during its production, offering more than 200 presets for ambient composition, sound design and experimental electronic music.

The library’s synthesizer collection centers on the SOMA Lyra-8, alongside a Ciat-Lonbarde Sidrax Organ, Minimoog Model D, Oberheim OB-X8, ASM Hydrasynth, Eurorack modular equipment and Norns/Grid/Just Friends. The instruments were recorded during sessions in Studio Helsinki, providing source material for pads, drones and evolving electronic textures.

Another distinctive source is a Ludwig & Co upright piano that has been in Whitacre’s family since 1903. The instrument is sampled in four dynamic layers with three round robins, with close and mid microphone mixes and five additional signal chains processed through Whitacre’s studio equipment.

The vocal material draws from recordings made at AIR Studios’ Lyndhurst Hall, including material from Spitfire’s previous Eric Whitacre Choir and Contrast libraries, alongside new aleatoric choir recordings. These performances have been granularized, stretched and processed until the original syllables become atmospheric textures.

Features:

• More than 200 presets combining synthesizers, piano, processed choir and electronic textures.
• Recordings of the SOMA Lyra-8, Ciat-Lonbarde Sidrax Organ, Minimoog Model D, Oberheim OB-X8 and ASM Hydrasynth.
• Additional source material from Eurorack, Norns, Grid and Just Friends instruments.
• Ludwig & Co upright piano samples recorded in four dynamic layers with three round robins.
• Close and mid microphone mixes, plus five processed piano signal chains.
• Granularized, stretched and processed choir recordings from AIR Studios.
• Five effects signals developed from Whitacre’s own equipment: Adorn, Weave, Dwell, Dance and Ruin.
• Dual-layer presets combining two sounds within a single patch.
• Assignable XY pad for blending between sound layers and controlling parameters.
• Additional presets created by six collaborating artists: BlankFor.ms, Lesjamusic, IDRA, Luca Longobardi, Matt Lowery and Elin Piel.
• Global effects and sound-shaping controls within the INSTRUMENT plugin.

Eric Whitacre on the Piano That Shaped His Sound:

Inside Eric Whitacre’s Modular Synth Rig:

Spitfire Audio Eric Whitacre Eternity is available now for an introductory price of $231, reduced from $289, through December 8, 2026.

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