成唯識論述記 5.814

5.814

述曰：此顯聞聲非唯意取，《顯揚論》說種種意故。然彼耳識亦能取聲，非唯定中意識能取此聲，共耳一時聞故，意不唯緣定中事故。

The Commentary states: This shows that hearing sound is not exclusively grasped by the mental consciousness, because the Prakaraṇāryavācā speaks of various kinds of mental consciousness. Rather, that ear-consciousness can also grasp sound; it is not that only the mental consciousness in concentration can grasp this sound, because it hears concurrently at the same time as the ear[-consciousness], and the mental consciousness does not exclusively take the events of concentration as its cognitive object.