Manage input monitoring latency in Logic Pro for Mac
Set the sample rate of your project and the I/O buffer size, and use Low Latency Mode to minimise the amount of latency (delay) you experience while recording audio or playing software instruments.
When recording audio or playing a software instrument in Logic Pro, you may experience a slight delay between playing or singing a note and when you hear the sound from your speakers or headphones. This delay is called input monitoring latency. A variety of factors contribute to input monitoring latency, including:
The input and output (I/O) buffer size setting in Logic Pro
The analogue-to-digital (A/D) and digital-to-analogue (D/A) conversion processes
Any audio interface software you're using
The sample rate of your project
Plug-ins inserted on tracks in your project
Although you can’t change the amount of input monitoring latency produced by the A/D and D/A conversion processes or by your audio interface’s software, you can set the sample rate of your project and adjust the I/O buffer size to minimise latency. You can also manage latency caused by plug-ins using Low Latency Mode while recording.
Set the sample rate of your project
Set the sample rate for your project when you first create it.
Adjust the I/O buffer size
The I/O buffers temporarily store some of the incoming and outgoing audio data to protect against audible dropouts, clicks or pops. You can change the I/O buffer size at any time to minimise latency.
In Logic Pro, smaller buffer sizes reduce input monitoring latency. However, smaller buffer sizes require more processing power, which can cause system overload alerts.
When recording, set the buffer to the lowest setting. If you encounter system overload alerts, increase the buffer size to the next setting. Projects with a lot of tracks or software instruments require higher buffer sizes, depending on the amount or RAM and the speed of the processor in your Mac.
To change the buffer size:
Choose Logic Pro > Settings (or Preferences), then click Audio.
Click Devices.
Choose the buffer size from the I/O Buffer Size pop-up menu.
Logic Pro shows the resulting latency under the I/O Buffer Size menu. Roundtrip latency is the total amount of input monitoring latency you'll experience from audio input to audio output.
Minimise plug-in latency with Low Latency Mode
Certain plug-ins can contribute to input monitoring latency, particularly dynamics plug-ins with look-ahead functions. Low Latency Mode can help minimise the latency these plug-ins produce while recording. Low Latency Mode is also useful when you want to record a software instrument in a project that includes latency-inducing plug-ins.
To turn Low Latency Mode on, choose Record > Low Latency Mode.
In Low Latency Mode, audio is routed around latency-inducing plug-ins to ensure all delays (across the entire signal flow of the current track) remain under the Limit slider value in the Plug-in Latency section of the General Audio settings. To change the Plug-in latency Limit setting:
Choose Logic Pro > Settings, click Audio, then click General.
Turn on Low Latency Mode.
Adjust the Limit slider to set the maximum amount of allowable plug-in delay in milliseconds.
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