![]() ![]() The difficulty lies in the fact that inevitably there will be slight variations in the devices' clocks. This is the case when transmitting digital signals between two devices (such as Pro Tools and a DAT machine), but also when you have more than one Pro Tools audio interface. The situation becomes complicated when there's more than one digital device involved. For a single isolated audio system, such as one Pro Tools rig with one audio interface, the clock needs to be reasonably accurate and consistent so that the music plays evenly and at the right speed (and therefore the right pitch). Obviously, if Pro Tools is recording or playing back audio at, say, 44100 samples per second, it has to have a way of telling what a second is, or more to the point, what 1/44100th of a second is. This might be the timing crystal in your Mix system's 888/24 interface, or your computer's internal clock in a Pro Tools Free setup. No matter what kind of Pro Tools system you use, somewhere or other in your studio there's a piece of hardware whose contribution is to mark the passage of time. ![]() ![]() Here's what you need to know in Pro Tools from a practical angle. The subject of clocking in digital audio systems is often a hazy area of understanding among us users, perhaps because we've been turned off by propellerheads who love arguing about it. Switching Pro Tools' clock source to external digital (in this case S/PDIF) is necessary to ensure clean transfers from DAT.
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