# 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.

# plotOptions.pie.sonification.defaultInstrumentOptions.mapping.lowpass

Mapping options for the lowpass filter.

A lowpass filter lets low frequencies through, but stops high frequencies, making the sound more dull.