See what is in the chord you cannot hear

Select a bar you are stuck on and SlowBird's reference keyboard lights up: one hue, brighter and larger where a pitch carries more energy across that passage. The murky bass note under a shout chorus, the alteration on the dominant, the note you keep guessing wrong — the heat map gives your ear somewhere to start.

It is deliberately honest about what it is. It reports the spectrum, folded onto equal-tempered notes — it does not name notes or chords for you, because a loud note lights its own harmonics and only your ear can tell which peaks are the music. It narrows the field; you make the call. That keeps it a learning tool rather than a crutch.

The keyboard doubles as a reference instrument: hold a key and it sustains a pure tone to check a note against the record. It follows the five-band EQ too, so cutting the rumble from an old transfer makes the map agree with what you actually hear. Then loop the bar and slow it down until it gives itself up.

macOS 14 or later · Your library stays on your Mac