pf2e.fyi
From Pathfinder Lost Omens The Grand Bazaar, which isn't enabled.

Harmonic Hauberk

ITEM 13
UNCOMMONAUDITORYFLEXIBLEFOCUSEDILLUSIONINVESTEDNOISY
Price 2500 gp
Bulk 1
Category light
Group chain
AC Bonus +2
Dex Cap +3
Strength +1
Check Penalty −1

Rose gold and copper rings in this +2 resilient chain shirt form a vague bird shape. The jingling links tinkle musically, almost like birdsong. While you wear the armor, effects with the auditory trait must first counteract the harmonic hauberk or they have no effect on you.

The harmonic hauberk attempts to counteract Silence spells cast on you and 4th-rank or higher heightened silence spells the first time the armor enters their area (counteract rank 4, counteract modifier +20). After failing to counteract a silence spell, the armor can't attempt to counteract the same spell again, even if you leave and enter the spell's area multiple times.

Activate command
Frequency once per day
Requirements You have a pool of Focus Points and at least one composition spell
Effect You gain 1 Focus Point and immediately use the Focus Point to cast Lingering Composition, using your Performance check to determine the effects of the spell, followed by the Rallying Anthem. You can use this activation to cast those spells even if you don't have the Lingering Composition or Rallying Anthem feats.
Pathfinder Lost Omens The Grand BazaarOGL