The algorithm doesn't provide an open position for G major, because in the G shape the iii chord (Bm) descends one fret lower on the third string than is possible in open position.

The same issue exists for A major. Similar issues exist for D major, which doesn't support the iii and vii chords in open position, and E major (iii, V, and vi chords).

Work around this by adding special cases for the CAGED keys (and possibly others that have a common open position?) in hydratePosition() in @/utils/chord-calculator.ts.

Sound stops working intermittently in iOS. It's somewhat reproducible like this:

• Open the about screen
• Click away to a Fretboard Foundation chapter
• Stay in that other tab for a bit
• Switch back to the Fret It tab

There are probably simpler ways to reproduce it.

No errors appear in the Safari web dev tools console.

It may have to do with a timeout, and the sound player going away. The hook gracefully ignores attempts to play when the sound player isn't available. Add some logging there to troubleshoot.

https://fretboardfoundation.com/caged.html#e-diminished-shape

In D major open position, the iii chord F#m is more commonly played as a full Em shape.

Do the same when it’s the vi chord in A major.