How to use: Tap Unmute to hear the audio. Use -1s / -100ms / +100ms / +1s to fine-tune this device's playback relative to the others. Your adjustments show in the counter between the buttons. Tap Sync to commit any pending changes and re-align to the live position. Tap Reset to wipe the offset back to zero.
If devices drift out of sync, try Sync first before nudging. On iPhone, if the audio mutes itself, tapping Sync restores it.