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ICON-303

Bass line synthesizer

Acid bass the way it should be.
Turn one knob and you're in.

ICON-303 is an acid bass synth with a built-in 16-step sequencer, designed around the sound of the classic 303. You get a raw saw or square wave, a gritty filter with squelching resonance, accents that really bite and slides that glide between notes. The brushed-metal hardware look with red lamps feels instantly familiar, but the workflow is modern and fast.

PatternA01
Tempo120 BPM
Downloads—
PriceFREE
64Patterns
8Acid lines included
4Filter characters
32Steps max
4Random styles
12Tone wheel

Meet the machine

Every lamp tells you something

ICON-303 plug-in: brushed-metal bass line synthesizer with Tune, Cutoff, Resonance, Env Mod, Decay and Accent knobs, a MIDI drag box, a pattern display, step, scale and swing controls, a 16-step sequencer with note, accent, slide and gate rows, and play, dirt, random, tempo, tempo sync and drive controls

Hover or tap the red lamps on the plug-in.

Try it in your browser

Program an acid line

A playable web version of the ICON-303. Drag the knobs, set notes, accents and slides, press play and sweep the cutoff. Click a note for the tone wheel. Turn your volume down a little first.

OUT
Transport
Tempo
120BPM
Wave
Filter
Dirt
Steps
Random style
 

Click a note for the tone wheel, or right-click for a semitone down. Red lamp = accent, red line = slide into the next step, gate = note length. Drag knobs up and down, double-click to reset.

A simple browser version for a first taste. The plug-in has 64 patterns, 32 steps, 1/4 to 1/16 scales, copy/paste/duplicate, Drive, DAW sync and MIDI drag-and-drop.

Everything inside

The full spec sheet

ICON-303 knob row: Tune, Cutoff, Resonance, Env Mod, Decay and Accent, plus the MIDI drag box
Six knobs, right where you expect them.

01Sound

Raw wave, gritty filter

  • 303-style voice

    Monophonic, with saw and square waveforms.

  • Resonant low-pass filter

    Four characters to choose from.

    Classic 303SmoothDirtyModern
  • Six knobs

    TUNE, CUTOFF, RESONANCE, ENV MOD, DECAY and ACCENT, right where you expect them.

  • Drive + Dirt

    DRIVE for warm saturation, plus a DIRT switch when it needs to get nasty.

ICON-303 step sequencer with note, accent, slide and gate rows
Note, accent, slide and gate on every step.

02Sequencer

16 steps of acid

  • 64 patterns

    Including 8 ready-made acid lines to get you started.

  • Steps, scale and swing

    8, 12, 16 or 32 steps in 1/4, 1/8 or 1/16, with swing.

  • Per step

    Note, accent, slide and gate length for every step.

  • Tone wheel

    Click a note and pick from a circle of 12 tones, or tap + and − to move a semitone up or down.

  • Random

    Four styles for instant inspiration.

    SubtleClassicWildMutate
  • Edit

    Undo, copy, paste and duplicate.

ICON-303 transport row: play, stop, Dirt, Random, tempo display, random style, tempo sync INT or DAW, and Drive
INT or DAW: follow your DAW or run at its own BPM.

03DAW workflow

From pattern to clip

  • Drag MIDI out

    Drag your pattern straight into your DAW as a MIDI clip, with accents, slides and swing included.

  • Drop MIDI in

    Drop a MIDI file onto the plugin to load it as a pattern.

  • Your DAW is in charge

    Hit play in your DAW and ICON-303 plays your clip exactly as it sounded in the preview.

  • Tempo

    Follows your DAW tempo or runs at its own BPM.

04Alive

A machine that's switched on

A column that lights up on every step, flashing accent lamps, a spark that follows the filter around the cutoff knob, and glowing displays. ICON-303 feels like a machine that's switched on.

Format: VST3 for Windows (64-bit) · free, always

Download free 4 MB

Reviews

What the acid heads say

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