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

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

Feel free to search this API through the search bar or the navigation tree in the sidebar.

# series.gantt.sonification.defaultSpeechOptions.pointGrouping.groupTimespan

The size of each group in milliseconds. Audio events closer than this are grouped together.