Finding the Key — Listen Mode and the Key Tracker

The 12-bar meter

The tracker is a row of twelve bars, one per possible key. As music comes in, each bar’s height shows how confident the wheel is that you’re in that key. Play in C for a while and the C bar rises above the rest. Modulate, and you’ll see a different bar start to climb. It’s a live readout of the app’s best guess, and a surprisingly good ear-training display in its own right — you can watch a key assert itself.

Listen, commit, reset

By default the wheel is in Listen mode: it keeps weighing every key and never fully commits, so it can follow music that wanders. That’s right for analyzing a track you don’t know.

But sometimes you want to pin it down — to study one key, or because the music is ambiguous and you know better than the detector. Click a bar to commit to that key. Now the wheel reads every chord relative to your chosen key and stops second-guessing. Reset returns it to Listen mode.

Committing matters for more than tidiness: the harmonic spaces only rotate once a key is locked. If the wheel seems stuck in HOME and won’t move into PAR or REL, commit a key first — that’s what gives “sideways” motion something to be relative to.

Keyboard shortcuts (desktop)

Three shortcuts speed this up:

• K — capture the current best-guess key (commit to whatever’s winning).
• C — commit straight to C, the wheel’s default home and the key most examples use.
• R — return to Listen mode.

What to Practice

• Put on a song in a clear key, turn on the mic, and watch the right bar climb to the top.
• Commit that key (click its bar) and notice the functions settle. Then Reset and watch it go back to weighing.
• Press C to jump to C, then explore the wheel and spaces in the key most of the teaching examples use.