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Sound effect generator with built-in mixer

Requires macOS Sonoma 14.6 or later

Need a laser zap? A coin pickup? A UI click? Wavelet generates sound effects on demand—no sample libraries, no licensing headaches, no hunting through sound packs. Simply sounds at the click of a button.

Powered by synthesis, every sound Wavelet creates is unique and royalty-free. Based on the classic sfxr tone generator, rebuilt for modern macOS.

Generator Presets

One-click templates for common sound types
35+ Parameters

Full control over many sound parameters
Multi-Sound Mixing

Layer multiple sounds with per-sound modifier controls
History System

Unlimited undo with visual history list and thumbnails
Parameter Locking

Lock parameters to preserve them during randomisation
Export Anywhere

WAV audio, Lua code, Swift code, and classic SFS binary

Sound Generation

Four waveform types—Square, Sawtooth, Sine, and Noise—combined with 35+ parameters across envelope, frequency, vibrato, filters, phaser, and arpeggio. 8x supersampling ensures high-quality output.

Generator presets get you started fast: Pickup/Coin, Laser/Shoot, Explosion, Powerup, Hit/Hurt, Jump, and Blip/Select. Hit Randomise for something completely new, or Mutate to make small variations on a sound you like.

Mix Multiple Sounds

Select 2+ sounds from your history to layer them together. Each layer gets independent offset, gain, and timestretch controls. The mixed waveform previews in real-time.

History & Undo

Every change is tracked. Browse your history visually with colour-coded entries and mini waveform previews. Lock entries to prevent deletion, rename them for reference, and navigate with arrow keys.

Export Options

WAV—PCM audio with metadata, configurable sample rate (up to 48kHz) and bit depth
Lua—Ready for LÖVE framework or other Lua environments
Swift—Includes usage example and documentation
SFS—Binary format compatible with original sfxr

Modern macOS

QuickLook including playback
Best practice window management with sidebar and inspector
Tabbed interface supports multiple documents in one window

Optimised

Only 913 KB app download size
Only 150 MB base memory footprint

How It Compares

Here’s how this app compares to other similar apps.

	Wavelet	sfxr	Enhanced sfxr
Platform	macOS	Win/Linux	Win/macOS
Multi-sound mixing	✓	–	–
History	✓	–	✓
Undo/Redo	✓	–	–
Parameter locking	✓	–	✓
Export WAV	✓	✓	✓
Export Code	✓	–	–
SFS compatible	✓	✓	✓
Mutate function	✓	✓	✓
8x supersampling	✓	–	–
App Store	✓	–	–

Wavelet is not affiliated with DrPetter’s sfxr