MJSFX

Sounds & effects design studio

Only for Mac

Free

Mac

From blank to bleep in seconds! MJSFX is a macOS sounds and effects design studio. The whole app is one tight creative loop: start from a generator, listen, adjust, tweak, play, and export a drop-in WAV. • Generators: Curated starting points for pickups, lasers, explosions, jumps, hits, power-ups, and UI blips. Pick one and you're already in the ballpark. • Layers: Stack multiple voices into a single sound, each with its own pitch sweep, amplitude envelope, and filters. • Effects: Per-layer chains of Reverb, Delay, Distortion, Bitcrush, Tremolo, Phaser, and ADSR. Drag to reorder; the signal flows left to right. • LFOs: Bring sounds to life: modulate pitch, filters, effect parameters, layer gain, and even other LFOs. Six waveshapes, loop or one-shot, live animated scopes. • Sound Portrait: Waveform, amplitude, and pitch fused into one live, color-coded image that redraws on every change. See what you hear. • Library: Save your sounds and reopen them as documents. Unsaved work is restored on relaunch. • Workspaces: Create and switch between separate sound libraries. • Formulas: Builds arps, octave stacks, runs, and harmonic stacks as new layers on top of the active layer • Discover: Mutate parameters in real-time for a fresh take, or randomize a brand-new sound. Every edit is undoable. • Themes: 20 built-in themes, light and dark, plus custom JSON themes you can install with a double click. Every visualization color is themeable. • Keyboard first. Drive the entire faceplate from the keyboard, jump between layers with Cmd-1 through 9, and customize every shortcut. • Extensive MIDI Support: Map knobs, faders, and pads to parameters, effects, LFOs, gains, and actions. Set an active layer's frequency to a MIDI note's exact Hz. • Export: Drop-in WAV at 44.1 / 22 / 11 kHz and 16 / 8-bit, plus per-layer stem export for your DAW or game engine. Make some noise!

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• Built for macOS 27 • Bug fixes

The developer, Matthew Schultz, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    The developer indicated that this app supports the following accessibility features. Learn More

    • Supported Features

      • Dark Interface

    Seller
    Matthew Schultz
    Size
    3.9 MB
    Category
    Utilities
    Compatibility
    Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    Languages
    English
    Age Rating
    4+
    Copyright
    ©2026 Matthew Schultz