Reduces all frequencies above the AudioEffectFilter.cutoffHz.
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MIT License
Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur. Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md) Copyright (c) 2017-2018 Godot-D contributors
Reduces all frequencies above the AudioEffectFilter.cutoffHz.