[TunesKit Audio Converter 在官网售价39.95美元，约合人民币240元]
for Mac 188.8.131.52 介绍
Audio Converter is a full-featured audio-conversion tool for all kinds of audio files, including DRM-protected Apple Music, iTunes and Audible audiobooks--as well as non-DRM audio files--to common MP3, M4A, AAC, FLAC, WAV, and M4B to enjoy everywhere. It's able to preserve the original quality of the music after conversion. Besides, it supports customization of output audio channel, bit rate, sample rate, etc.