Browser-local audio utilities

Audio Tools

Reverse audio, measure tap tempo, and convert BPM to musical delay times without sending audio to a server.

Reverse Audio

Reverse browser-decodable audio locally, preview the result, and download a WAV.

Recent-interval tempo estimate, keyboard/touch controls, half-time, and double-time.

Straight, dotted, and triplet note durations in milliseconds.

Practice with a browser-local metronome, BPM, beats per measure, accent, and volume.

Generate a local sine, square, triangle, or sawtooth tone with frequency and volume controls.

Explore compatible scales, transpose chord symbols, and compare note intervals locally.

Find scales and modes whose pitch classes contain every selected note.

Transpose chord symbols by semitones or key change while preserving suffixes and slash chords.

Compare note spellings, semitone distances, and simple interval names.

Run a conservative browser-local left, right, and both stereo channel check.

Inspect local microphone frequency energy with a private Web Audio FFT spectrum.

Select pitch classes to identify exact chord qualities and optional bass-note inversions.

Practice recognizing musical intervals with local audio and session scoring.

Decode a local audio file and render a bounded time-domain waveform without recording or uploading.

Inspect a local Standard MIDI file as tracks, events, tempo, notes, channels, and a piano roll without playback.

Convert frequency, MIDI note number, nearest 12-TET note, and cents deviation using an explicit A4 reference.