Board Thread:General Discussion/@comment-26873003-20150828202945/@comment-26873003-20150828221921

I think I figured the difference out. First of all, Echoes Act 2 can only make one sound effect at a time, while In a Silent Way (as seen in the manga) is capable of creating numerous "sounds" on multiple things at a time. Second of all, In a Silent Way is capable of actually realize the "sounds" into physical objects shaped like kaniji symbols in order to create a shield. If I recall correctly, Echoes Act 2 is not capable of this, or at least haven't shown this ability ever.

Is there anything more to it?