# 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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# plotOptions.series.sonification.tracks.mapping.time

Time mapping determines what time each point plays. It is defined as an offset in milliseconds, where 0 means it plays immediately when the chart is sonified.

By default time is mapped to `x`, meaning points with the lowest `x` value plays first, and points with the highest `x` value plays last.

Can be set to a fixed value, a prop to map to, a function, or a mapping object.