The Capo Blog

Notes on listening closely.

Guides, tutorials and a little music theory — on changing the pitch, key, speed and volume of anything on the web. From the team behind Capo.

The tape effect, varispeed, formants and time-stretching — why modern speed control keeps the pitch natural, explained simply.

Slow the hard parts to a crawl, loop them until they stick, and transpose to a comfortable key — the complete by-ear method.

The Spotify Web Player, SoundCloud and Bandcamp don't ship pitch controls — Capo adds them to all three.

Take lectures, talks and podcasts at up to 3× while voices stay natural — and have your pace saved per page.

Drop any video or track to a quarter speed to learn it, while the pitch stays exactly where it was.

Capo a recording to the key that fits your range or your instrument's tuning — without re-recording a thing.

Shift any track up or down by ±12 semitones, in real time, without touching the speed — free and in your browser.

Everything Capo does — pitch, speed, A–B loop and volume — and how to use it, in one place. Free, no account, on-device.