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There is a Legacy version here.

PFS StandardDiscordant Voice Feat 18

Bard Sonic 
Source Player Core pg. 107 2.0
Prerequisites Courageous Anthem

Your courageous anthem lets loose a discordant shriek that imbues your allies’ attacks with powerful sonic reverberations. While your allies are affected by your courageous anthem, their weapon Strikes and unarmed attacks deal an additional 1d6 sonic damage.

Traits

Sonic:

An effect with the sonic trait functions only if it makes sound, meaning it has no effect in an area of silence or in a vacuum. This is different from an auditory spell, which is effective only if the target can hear it. A sonic effect might deal sonic damage. A creature with this trait has a magical connection to powerful sound.