https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/metronome-tuplet/
The metronome-tuplet element | MusicXML 4.0
the metronometupletelementmusicxml4
https://play.google.com/store/apps/details?id=com.asteroidzone.barbara&hl=en
BARBARA the Metronome - Apps on Google Play
Changing time signatures (mixed meters) handled.
the metronomebarbaraappsgoogleplay
https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/metronome-note/
The metronome-note element | MusicXML 4.0
the metronomenoteelementmusicxml4
https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/metronome-relation/
The metronome-relation element | MusicXML 4.0
the metronomerelationelementmusicxml4