# Welcome to the Highcharts Maps JS (highmaps) 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.contour.sonification.contextTracks.mapping.tremolo.depth

Map to tremolo depth, from 0 to 1.

This determines the intensity of the tremolo effect, how much the volume changes.