Within Audio MIDI Setup, the Drift Correction setting can be enabled for the devices contained within an aggregate. Fortunately, there is a solution to avoid this problem. If these diferences aren't mitigated, audio will eventually go out of sync. The other devices within an aggregate will have slightly varying sample rates, as mentioned above. One device within an aggregate device serves as the “clock source”, and its sample rate is what will be used for the overall sample rate of the aggregate. Over time, these miniscule sample rate differences can build up, and can cause audio to get out of sync.įortunately, this limitation of aggregate devices can be worked around. 44100 Hz), which means that every audio device within an aggregate will produce or consume audio at a slightly varying sample rate. Audio devices rarely operate at exactly the sample rate they claim (e.g. While aggregates appear on the system as a single device, their audio is of course provided by each of the distinct audio devices contained within. ![]() When doing so, special care must be taken, to avoid issues with audio sync. Users often include Loopback virtual devices within an aggregate device. ![]() On MacOS, aggregate devices provide a way to merge multiple distinct audio devices into one single virtual device.
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