Purpose of this yield()?

I'm sure this isn't the right place for this, but I'm not sure where else to ask.

Is there a purpose to the yield() on this line? I've tried your code without it, and can't hear any noticeable difference/

https://github.com/bbx10/SFX-I2S-web-trigger/blob/master/espi2s.ino#L85