The ancient zither Ye Yinzhu owned was the Artifact-ranked Cascade Pearl Beads Zither.
It wasn't that he didn't want to use the Super Divine Artefact - Desolate Dragon Yin.
But that Super Divine Artefact was too overbearing, more suitable for attacking; meanwhile, what Ye Yinzhu needed to do was to assist the Grim Reaper Dragon Wolf Cavalry. Without a doubt, the Cascade Pearl Beads Zither was more appropriate.
The connection between zither music and ancient zithers is subtle; the same piece played on different zithers can have different effects.
For instance, the "High Mountain Flowing Water" song that Ye Yinzhu had just played would have been more aggressive if performed using the Super Divine Artefact - Desolate Dragon Yin's Zither, meaning it would have been better at weakening enemies.
However, the effect of enhancing allies wasn't as good as with the Cascade Pearl Beads. The Cascade Pearl Beads was the most suitable ancient zither for this song.