The Adams Smith Zeta Three is a synchronizes two machines to increase available tracks. The most common way we use this is to sync our 8 track Otari with our 16 track Fostex to achieve 22 tracks (one track is sacrificed per unit to store SMPTE time code, which keeps the machines locked). This requires that two blank tapes are available.

This device can sync to almost anything that plays sound – yes, including ProTools!zetathree