Random SE Maker

Random SE Maker is an all-in-one browser tool for randomly generating, editing, and combining professional sound effects.

■ One-Click Generation from 9 Categories Choose from Full Random, Game UI, Notification, Explosion, Alarm, Sci-Fi, Bass Drop, Jackpot, or Sub Bass. Each category optimizes frequency range, waveform, and effects, producing a unique sound effect every time.

■ 12 Tone Presets Beyond basic waveforms (Sine, Square, Triangle, Sawtooth), the tool features 12 tone presets built with PeriodicWave (custom harmonics) and FM synthesis: Piano, E.Piano, Organ, Bell, Bass Synth, Lead Synth, Pluck, Brass, 8-bit, Metallic, and EDM Bass. No samples needed — all timbres are generated in-browser. Lock a preset to explore variations with the same timbre.

■ Audio Analysis & Parameter Import Upload a WAV/MP3/OGG file (drag & drop supported) and the tool automatically analyzes it: pitch (autocorrelation), waveform type (crest factor), volume envelope (RMS), frequency envelope, noise level (zero-crossing rate), and sweep direction. Results are applied to the UI parameters, enabling "make more sounds like this" workflows.

■ Manual Adjustment & Parameter Locking Fine-tune frequency (logarithmic 20–8000Hz), waveform, duration (up to 10s), and sweep direction, then click "Manual Generate." Each parameter has a lock toggle — locked items persist across random generations. For example, lock "Bell tone + 500-1000Hz" and randomize everything else.

■ Fixed Value / Range Random Toggle Frequency and duration offer a toggle between "Fixed Value" (single slider) and "Range Random" (dual-thumb slider for min/max). When range mode is selected, the lock is automatically enabled, ensuring random generation stays within your specified range.

■ Interactive Frequency Canvas Drag 5 dots on an interactive canvas to visually shape the frequency curve. Vertical drag changes the frequency value; horizontal drag adjusts keyframe timing. Move dots right for "build-up then sudden change" effects, or left for "instant change then slow sustain" — creating EDM-style pitch swoops intuitively. The area below the curve is filled in green, showing where sound is active.

■ Volume Shape 5 keyframe sliders with 6 presets (Decay, Swell, Attack, Pulse, Sustain, Flat) let you draw custom volume envelopes. Create sounds that crescendo then fade, pulse rhythmically, or hold steady before dropping.

■ Rich Effect Chain Echo (delay feedback), reverb (convolution), fade in/out, white noise mix, pitch bend (LFO vibrato), reverse playback, and silence padding (before/after). All controlled via checkboxes and sliders, with the entire effects section lockable.

■ Batch Generation & Hold System Batch generate 3, 5, or 10 SEs at once. The list holds up to 30 entries (newest first) with one-click preview, parameter loading, and WAV download. "Hold" favorites (up to 10) to protect them from rotation. Duplicate within the hold list for reuse.

■ DAW-Style Timeline Combining Drag & drop held SEs onto a visual timeline to combine them into one longer SE (up to 30 seconds, 30 items max). Place the same SE multiple times, drag blocks to adjust positions, zoom, and use the ruler. Real-time info shows overlaps, gaps, and durations. Upload external audio files (WAV/MP3/OGG) directly to the timeline. Peak normalization prevents clipping during mixing.

■ Random Combine Randomize timeline arrangement: SE count (2–10), max layers (1–5), gap range (ms), overlap density, repeat allowance, and order. Each setting has its own lock toggle. Auto-previews after generation.

■ Downloads Individual WAV, bulk ZIP of selected SEs, or combined timeline WAV. All files are 44100Hz 16-bit PCM WAV — ready for game engines, video editors, and presentation software.

■ Instant Samples on Load Three sample SEs (Game UI, Sci-Fi, Explosion) are auto-generated and placed on the timeline when the page opens, so you can explore every feature immediately.

All processing runs entirely in-browser via the Web Audio API. No server uploads, no installation — just open and create.