j.mp3 labs

VST3 & AU audio plugins

Shape the
space between.

Tempo-synced ducking.
Your curves. Your sound.

Explore Pulse Ducker

Free VST3 · AU · macOS · Windows · Linux (Beta)

Pulse Ducker 1.2.0: user presets, editable envelopes, lookahead and sidechain waveforms.

Pulse Ducker

Free sidechain ducking with lookahead, draggable envelopes and user presets.

Vox Morph interface with pitch and formant dials, MIDI harmony controls and input/output meters.

Meet your other voice

Vox Morph

Vocal pitch and formant shifting.
MIDI harmonies. Your own presets.

$25 · One-time purchase · Free updates

Get Vox Morph — $25 Explore Vox Morph

VST3 · AU · macOS · Windows

The BIG interface with its cartoon character, live input and output waveforms, and Amount, Tone and Output dials.

Small. Big. The BIG.

The BIG

Saturation and density.
More body. More bite.

$15 · One-time purchase · Free updates

Get The BIG — $15 Explore The BIG

VST3 · AU · macOS · Windows

Chord Lab 1.0.0 interface showing Cmaj9 output, chord qualities and extensions, Auto Voicing, MIDI Learn, Melody Mode and separate modifier and root keyboards.

Play the possibilities

Chord Lab

Turn one root into a chord.
Keep your favorite instrument.

$29 USD · One-time purchase

Get Chord Lab — $29Explore Chord Lab

VST3 only · Universal Mac · Windows 64-bit

Requires MIDI output routing. Logic Pro is not supported in this initial release.

For creators

Earn 30% as a creator

Share j.mp3 labs with your audience and earn 30% commission on referred sales. Apply to join the creator affiliate program.

Apply to join

j.mp3 labs

Small, focused audio tools from the james.mp3 signal chain.

Pulse Ducker shapes movement with tempo-synced ducking and customizable curves. Vox Morph brings pitch, formant and MIDI harmony shaping to your voice. The BIG adds density and saturation with one big dial.

Pulse Ducker 1.2.0 is free, with lookahead, draggable envelopes, user presets and a resizable light or dark interface.

Contact the lab VST is a registered trademark of Steinberg Media Technologies GmbH.