The sync type specifies the style that a score following application should use the synchronize an accompaniment with a performer. If this type is not included in a score, default synchronization depends on the application.
The optional latency attribute specifies a time in milliseconds that the listening application should expect from the performer. The optional player and time-only attributes restrict the element to apply to a single player or set of times through a repeated section, respectively.
The
<sync>element.The sync type specifies the style that a score following application should use the synchronize an accompaniment with a performer. If this type is not included in a score, default synchronization depends on the application.
The optional latency attribute specifies a time in milliseconds that the listening application should expect from the performer. The optional player and time-only attributes restrict the element to apply to a single player or set of times through a repeated section, respectively.
See
https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/sync/