Drag the click wheel to adjust the volume. 拖移點按式轉盤以調整音量。
This avoids the common problem of having to manually adjust volume levels when playing audio files from different albums that have been mastered at different levels. 這樣就可以避免因製作時制定的標準不同而造成在播放不同專輯的音頻文件時需要不斷手動調整音量的問題。
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