# Welcome to the Highcharts Maps JS (highmaps) Options Reference

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

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# series.mapline.sonification.contextTracks.valueInterval

Set a context track to play periodically every `valueInterval` units of a data property `valueProp` while the sonification is playing.

For example, setting `valueProp` to `x` and `valueInterval` to 5 will play the context track for every 5th X value.

The context audio events will be mapped to time according to the prop value relative to the min/max values for that prop.