# Welcome to the Highcharts Gantt JS (gantt) Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

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# sonification.events.onBoundaryHit

Called when attempting to play an adjacent point or series, and there is none.

By default a percussive sound is played.

A context object is passed to the function, with properties `chart`, `timeline`, and `attemptedNext`. `attemptedNext` is a boolean property that is `true` if the boundary hit was from trying to play the next series/point, and `false` if it was from trying to play the previous.