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# 2.4.1 Introduction

The MPLAB Harmony USB Audio 2.0 Device Library (also referred to as the Audio 2.0 Function Driver or library) features routines to implement a USB Audio 2.0 Device. Examples of Audio USB 2.0 Devices include USB Speakers, microphones, and voice telephony. The library provides a convenient abstraction of the USB Audio 2.0 Device specification and simplifies the implementation of USB Audio 2.0 Devices.