Real-time Pitch Shift — ±12 semitones, tempo locked

The most common situation in vocal practice is a "great song, wrong key." If you try to fix the key by changing the speed of the backing track, the song becomes too fast or too slow to sing along to.

The reverse happens when you want to study a guitar or piano part slowly: drop the speed in a normal player and the pitch sags into a "chipmunk in reverse," making the actual notes harder to identify.

ToneBrowser controls the two parameters separately. You can lower only the pitch, lower only the speed, or move both at once — each one independent of the other.

The range runs from -12 semitones (one octave down) to +12 semitones (one octave up) — 25 steps in total. The default step is one semitone, and an in-app fine-tune slider lets you correct in cents (quarter-tones) when a single semitone is not quite right.

Most pop songs land in a karaoke-friendly key within -5 to +3 semitones of the original. A man singing a song written for a woman usually starts around -5; a woman singing a man's song around +5, and both are available as one-tap presets.

There are no files to upload and nothing to convert. ToneBrowser attaches directly to the playback stream of YouTube, SoundCloud, and most music sites and processes it on the fly. Move the slider and the change is reflected instantly, with no buffering.

Changing the pitch mid-playback keeps your position in the track. If you want to drop the key one more semitone for the second verse, you just move the slider — the song keeps playing.