How to Change Logic Pro Output: Routing Audio to the Right Destination

Getting sound out of Logic Pro seems straightforward — until you realize the software gives you multiple layers of control over where that audio actually goes. Whether you're switching from headphones to studio monitors, routing to an external interface, or managing complex internal busses, understanding Logic Pro's output system saves you from chasing phantom volume issues and mysterious silence.

What "Output" Actually Means in Logic Pro

Logic Pro handles output on two distinct levels, and confusing them is the most common source of frustration.

System-level output is controlled by macOS — it determines which physical device receives audio from your Mac. Project-level output is controlled inside Logic Pro itself, determining how tracks, busses, and the master channel route audio within the session.

Both need to be configured correctly for sound to reach its intended destination.

Changing the System Audio Output Device

Logic Pro respects the audio device selected in your Mac's system settings, but it also has its own device preference built in.

To set or change the output device Logic Pro uses:

1. Open Logic Pro → Settings → Audio (or Preferences → Audio in older versions)
2. Under the Devices tab, find the Output Device dropdown
3. Select your target device — this could be your built-in speakers, a connected USB interface, a Thunderbolt audio device, or a virtual driver

This setting overrides macOS system audio for Logic specifically, meaning Logic can send audio to your audio interface while your Mac system sounds go elsewhere. That separation is intentional and useful in professional workflows.

🎛️ If you've just connected a new interface and it isn't appearing, a quick toggle of the device selection — or relaunching Logic — usually forces a refresh of available devices.

Changing Output Assignments Inside a Logic Project

Within a session, every channel strip in the Mixer has an output assignment. By default, most tracks route to Output 1-2, which represents the stereo main output of your selected device. But you can change this on any track.

To change a single track's output:

• Open the Mixer (X key or View → Mixer)
• Locate the channel strip for the track
• Click the I/O section at the bottom of the channel strip (where you see "Output 1-2" or similar)
• A dropdown appears listing all available output pairs from your audio device

Multi-output interfaces expose additional output pairs here — Output 3-4, Output 5-6, and so on — allowing you to send different tracks to different physical outputs simultaneously.

To change multiple tracks at once:

• Select multiple channel strips in the Mixer (Shift+click or Command+click)
• Change the output on one selected strip and the rest update together

Routing Through Busses and the Stereo Out Channel

Logic Pro uses a bus-based routing system for internal signal flow. Aux channels and the Stereo Out channel strip are where most output shaping happens.

The Stereo Out channel is the master output by default. It inherits whatever output device and output pair you've configured. Changing its output assignment in the Mixer changes where the entire mixed signal is sent — useful when you want to route Logic's master output to a specific pair of outputs on a multi-output interface.

Bus channels (Aux tracks) are intermediate routing points. If you're using sends and returns for reverb or compression, those Aux tracks also have their own output assignments. An Aux routed to the wrong output won't be heard through your main monitors, even if the source tracks are perfectly routed.

Output Routing for Multi-Output Instruments

Software instruments like Drum Kit Designer and Ultrabeat support multi-output configurations — meaning individual drums or instrument layers can be sent to separate channels in the Mixer for independent processing.

To enable this:

1. In the Instrument track header, click the small arrow icon next to the instrument plugin
2. Select Create Additional Output Tracks or similar (the wording varies by instrument)
3. New aux tracks appear in the Mixer, each assignable to their own output

This only becomes relevant with multi-output-capable instruments and is separate from the standard single-stereo-output workflow most users operate in.

Variables That Affect Your Output Configuration 🔊

The right output setup depends on factors specific to your situation:

Users running a basic built-in audio setup have far fewer decisions to make than someone running a 16-output interface with a complex live routing template. The underlying controls are the same; the complexity scales with the hardware.

When Output Changes Don't Seem to Stick

A few specific situations cause output settings to behave unexpectedly:

• Sample rate mismatches between Logic and the interface can cause device switching failures or silent output
• Core Audio conflicts from other open applications claiming exclusive device access occasionally block Logic's output changes
• Saved project templates may have hardcoded output assignments that override your current device's available outputs — particularly if the session was built on a different interface

Checking Logic's Audio settings, the Mixer output assignments, and your interface's own control panel (if it has one) in combination usually isolates where a routing problem is actually occurring.

The degree to which you need to manage all of this — versus simply leaving Logic on its defaults — comes down entirely to your monitoring setup, interface capabilities, and how complex your sessions actually are.