I discussed volley fire with crossbows in https://www.reddit.com/r/AskHistorians/comments/aae7u9/how_similar_were_ancient_chinese_crossbow_tactics/

The summary: the Chinese were using volley fire with crossbows possibly as early as 169BC, definitely by the Song, and probably by the Tang. Later, when they adopted muskets, they also used volley fire:

• Crossbowmen: https://commons.wikimedia.org/wiki/File:1639_Ming_crossbow_volley_formation.jpg

• Musketeers: https://commons.wikimedia.org/wiki/File:1639_Ming_musketry_volley_formation.jpg