Seedio is an app that syncs multiple iOS speakers together | Ubergizmo - 1 views
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younginlee on 02 Aug 12"While Seedio might not be able to boost the volume on your iPhone's speakers, it will instead allow you to beam the song you're currently playing on your iPhone to other iOS devices on the same WiFi network who also have Seedio installed, essentially turning all iOS devices in the room/house into one giant unified speaker. "