The Adams Smith Zeta Three synchronizes two machines to increase available tracks. The most common situation is to sync the 8 track Otari with the 16 track Fostex, effectively allowing us up to 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! Email us if you want to know more.
If you are interested in tape synchronization, specifically using a ZETA~THREE, have a look at Rick Austin’s web page, he is extremely knowledgable and kind!