Create sweeping comb-filter tones with short modulated delay, positive or negative feedback, and wet polarity controls. Hear changes live and preview the actual processed WAV.
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Up to 128 MiB per file; decoded audio up to 256 MiB (about 23 min mono / 11½ min stereo). Formats depend on your browser's decoder. Working audio and WAV exports use 48 kHz.
Choose audio to begin. Nothing plays automatically.
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Your waveform will appear here.
Load audio to choose a section.
Click the waveform to seek the source; use Play/Pause, exact time or jump controls. Rate, delay, depth, feedback, wet polarity, mix and trim change live. This source audition stops at the source end; create the WAV to hear its complete selected tail. Seeking or resuming resets feedback history; modulation keeps source-time phase at a fresh start.
Playback stopped.
Change settings while playing to hear flanger live. Uncheck to compare original audio; exports always use the selected effect.
Quick sliders pause for exact values finer than their steps; your entered value remains usable. Presets include trim and clip-ending mode.
The original file stays unchanged.
Input up to 128 MiB; source and output float audio each have a 256 MiB limit. Output planning includes the optional short tail. Live changes are smoothed; changing delay or depth can briefly sweep pitch. The actual WAV applies current fixed settings, not a history of knob movements.
Create a WAV to preview the actual adjusted file.
48 kHz · 16-bit PCM WAV · original channel count. Independent stereo feedback lines share modulation and controls, with no crossfeed or automatic widening. Linear fractional-delay interpolation keeps feedback bounded; strong settings can still build peaks. No limiter or normalization. Final clipped samples are counted. Live audition ends with the source; the actual WAV includes a selected tail. Settings changes clear exports; Stop terminates the local worker.
Your audio is never uploaded to any server. Decoding, flanger processing, playback and WAV encoding run locally in your browser using self-hosted code. No account, external processing service or audio history is required.
Flanger combines original audio with a much shorter moving delay, creating sweeping comb-filter peaks and notches. Feedback intensifies resonance. Chorus generally uses longer delays and multiple voices for a layered sound. This flanger uses one modulated feedback line per source channel with common settings, no crossfeed or automatic stereo widening.
Rate is 0.05–5 cycles per second, base delay 0.5–10 ms and depth 0–5 ms. The tap sweeps between base minus depth and base plus depth; base must be at least 0.1 ms greater than depth (within working floating-point precision). Zero depth creates a static comb effect, not bypass. Live parameter changes are smoothed and can briefly change wet pitch.
Feedback ranges from −80% to +80%. Negative feedback reverses what returns to the delay line and changes the resonance pattern. Wet polarity separately inverts the delayed output branch for another notch pattern; it does not swap channels or invert dry audio. Feedback uses linear interpolation and remains unclipped internally, with numeric guards. Strong settings can still raise output peaks.
Mix is a linear dry/wet crossfade. 0% retains original decoded audio before trim, 50% often gives pronounced comb notches and 100% is delayed sound only. Output trim is −24 to +6 dB and applies to the entire result. Final PCM clipping is counted; no automatic limiter, normalization or make-up gain is included.
Original-duration mode trims the decay at the source end. Include estimated tail uses maximum delay and absolute feedback to include the first repeat below −60 dB relative to the first echo; it is not a measured silence threshold and can cut remaining sound without a fade. Zero wet mix disables appended tails. Live audition stops with the source; the actual WAV player includes a selected tail. Seeking or resuming resets feedback history, so its startup can differ from the full export.
Yes. Rate, delay, depth, feedback, wet polarity, mix and trim update the playing local AudioWorklet without source restart. Smoothing retains continuous modulation phase and softens control transitions. Export applies your current fixed settings, not a recording of live knob movements.
One mono/stereo file up to 128 MiB, decoded at 48 kHz within a 256 MiB float budget. Output has its own 256 MiB float budget, including a selected decay tail; an at-limit source may require original-duration mode. Device memory may impose lower limits. Live AudioWorklet needs a supported browser and HTTPS or localhost. Export is 48 kHz 16-bit PCM WAV; tags/artwork are omitted. Stop/edit/clear/replacement terminates its local export worker and rejects obsolete results.
