Ableton Extensions

JS Loop Mutator is an Ableton Live Extension for turning audio clips into new mutated loops. It opens directly from an audio clip, slices the source material, rearranges and processes the slices with pattern lanes, and exports the result back into Ableton Live.

The workflow is simple: right-click an audio clip, launch JS Loop Mutator, choose a slice length, randomize or edit the pattern lanes, preview the result, and export a new loop. The original clip is left untouched.

Pattern lanes give direct control over how each slice is played and processed. You can use the step-box display for quick editing, click a lane to type patterns manually, or use per-lane randomization controls to generate controlled variations.

Each lane includes per-lane randomize, reset, and lock controls. Numeric lanes also include Min, Max, and Freq controls for shaping randomization. Randomize All can generate a full variation while respecting each lane’s limits and locked state.

Version 1.8.0 expands the filter pattern system. The former Filter lane is now shown as Filter Env, and two new per-slice overlay lanes have been added: Filter Env Dir and Filter Type. Filter Env controls where the filter envelope is active, Filter Env Dir can force UP or DN per active filter step, and Filter Type can force LP, BP, HP, or Notch per active filter step. Both overlay lanes can fall back to the global filter settings when set to “-”.

JS Loop Mutator includes slice order, reverse, stutter, pitch, tape stop, filter envelope, filter envelope direction, filter type, flanger, bitcrush, and gated reverb lanes. The filter section includes LP, BP, HP, and Notch modes with cutoff, resonance, drive, envelope direction, attack, and decay controls.

Source and result waveform previews, numbered slice markers, output length control, snapshots, queue export, and support for both Arrangement View and Session View clips are included.

A full user manual for JS Loop Mutator is included in the zip package.

JS Drum Rack Splitter is an Ableton Live Extension for turning a Drum Rack track into separate tracks for mixing, editing, arranging, exporting, or further sound design.

The workflow is simple: right-click a Drum Rack track, launch JS Drum Rack Splitter, choose how you want to split it, and let the extension create the output tracks. The original source track is left untouched.

Clean Split creates clean individual MIDI tracks for each Drum Rack pad. It rebuilds supported devices, copies parameters, splits MIDI clips, and remaps notes to C3 for standalone Simpler playback.

Preserve Mode duplicates the original Drum Rack track per pad or pad group, preserving Simpler modes, Max for Live devices, effects, and internal device state. This mode is useful when you want to keep the original rack behavior as intact as possible while still separating the material into new tracks.

Preserve Mode also includes a manual Choke Groups step. Pads assigned to the same output group are kept together in one duplicated Drum Rack, so related pads such as open and closed hi-hats can preserve their existing Drum Rack choke behavior after the split.

You can choose to split all populated pads or only pads that are actually used in MIDI clips. Output tracks are created in natural pad order from low to high MIDI notes, making the result easy to navigate and ready for mixing, editing, arranging, exporting, or further sound design.

JS Loop Collage is an Ableton Live Extension that generates entirely new tempo-synced audio loops from the audio already contained in your project.

Simply select a time range across one or more audio tracks, launch JS Loop Collage, and choose a loop length, slice size, number of variations, crossfade mode and seed value. The extension renders the selected audio, extracts tempo-synced snippets, randomizes their order, and assembles them into new loop variations.

Version 1.3.0 adds a new chance-based FX section inherited from JS Loop Mutator. Both extensions now share the same set of effects, while still keeping their own workflows. Loop Mutator is more pattern-based and hands-on, while Loop Collage stays random, fast and generative.

You can set the probability for each effect, and JS Loop Collage will randomly apply different strengths per slice from the seed. Per-slice FX include Reverse, Stutter, Pitch, Tape Stop, Filter, Flanger, Bitcrush and Gated Reverb.

The Filter section includes its own controls for chance, cutoff, resonance, attack, decay, drive, filter mode and envelope direction, making it possible to create anything from subtle movement to more broken, animated textures.

Crossfade modes can create smoother transitions for pads, drones and ambient material, but can also produce unexpected grooves and transitions on rhythmic material.

JS Loop Collage renders 48 kHz / 24-bit WAV files and automatically imports them into your Live Set as standard audio clips.

JS Sweeper is an Ableton Live Extension that generates custom sweeps directly inside your project.

Simply select a time range on an audio track, launch JS Sweeper, and choose between noise-based sweeps, oscillator-based risers, a blend of both, or a Reverse Reverb Sweep based on a selected audio clip. The extension then generates a fully rendered sweep that matches the length of your selection.

Choose from White, Pink or Brown noise, Saw, Sine or Square oscillators, configurable pitch sweeps, adjustable noise/oscillator blending, filter sweeps, movement modulation, stutter effects, drive processing, phaser, flanger and chorus effects. Reverse Reverb Sweep lets you create long reverse reverb builds from existing audio clips and blend them with the generated sweep.

Stereo mode adds subtle channel variations and modulation offsets to create a wider and more spacious sound, while automatic normalization ensures consistent output levels regardless of the selected settings.

JS Sweeper then renders a 48 kHz / 24-bit WAV file and automatically imports it into your Live Set as a standard audio clip.

JS Operator Randomizer is an Ableton Live Extension that generates entirely new sounds for Ableton's Operator synthesizer.

Simply place an Operator device on a MIDI track, launch JS Operator Randomizer, choose an intensity mode, optional sound design settings and a seed value, then generate a completely new patch with a single click.

The extension randomizes Operator’s synthesis engine, including oscillator structure, FM algorithms, waveforms, envelopes, filters, modulation sources, stereo characteristics and output settings. Unlike preset browsers, JS Operator Randomizer creates entirely new sounds rather than selecting from an existing preset library.

Three intensity modes allow you to control how far the generated sound can deviate from its starting point. Subtle creates smaller variations, Balanced generates broader musical changes, and Wild explores more experimental territory.

Additional controls make it possible to lock volume envelopes, output volume and transpose settings while still randomizing the rest of the synthesizer. Safe Output mode helps prevent extremely loud or extremely quiet results, while Extreme Mode removes some of the safety limits and allows more aggressive FM structures, feedback amounts and modulation routings.

If no Operator device is present on the selected MIDI track, JS Operator Randomizer can automatically insert a new Operator instance before generating a sound.

Every generated sound is based on a reproducible seed value. Using the same seed and settings will always recreate the same result.

During sound generation, the extension window temporarily closes while Operator parameters are updated inside Live. Once the randomization process is complete, the window automatically reopens with your previous settings preserved, allowing you to quickly generate and audition multiple sounds without reopening the extension manually.