It’s an accepted “best pactice” of most audio software providers that audio files should be recorded on a hard drive other than the Mac’s Startup drive (i.e. the drive on which the operating system is installed). You can probably get away with recording a few tracks to your computer’s Startup disk, but for the best performance of your Apogee recording system, record onto a separate ATA/IDE, SATA, or FireWire drive whose spindle speed is at least 7200 RPM.
Go to the Logic Pro or Logic Express menu and choose Preferences > Audio.
In the Core Audio pane of the Device tab, select Duet 2 for Output Device and Input Device.
Set the I/O Buffer Size to 128.
Click Apply Changes at the bottom of the Preferences window.
By selecting Duet 2 input and output labels in Logic, the labels you see in Logic’s Channel Strip input and output slots correspond exactly to Duet 2’s hardware inputs and outputs, making I/O assignment much easier.
1. In Logic, choose Options > Audio > I/O Labels.
2. Select the labels in the Provided by Driver column.
3. Close the IO Labels window.
Now close the Logic Pro Preferences window and select
New > Collection > Empty Project from the Trackmenu.
If you are recording a single microphone or instrument, make the following selections in the New Tracks dialog box:
Input: Input 1
Check the Input Monitoring checkbox
Check the Record Enable checkbox
Logic will now ask you to name the project and save in on your hard drive.
Click the Record button in the transport control at the bottom of the Logic window.
You’re now recording with Duet 2!
Warning! Apogee’s Control Panel within GarageBand is not compatible with Duet 2
If you have Duet connected when you launch GarageBand
Choose GarageBand > Preferences > Audio/Midi
Choose Duet USB for Audio Output and Audio Input
Symptom: Apogee Maestro will not properly recognize Duet 2 (USB) if Mac user is logged into a Guest Account. Maestro simply says “No Apogee Systems Found”.
Resolution: Confirm you have latest Duet software installed (you can download here), go to Apple Menu>System Preferences>Show All>System Accounts>My Account view>Set User Name to Admin, restart the Mac and Maestro will now launch successfully.
This delay is called latency, and is caused by your computer and/or recording software.
Using the low latency mixer found in the Apogee Maestro 2 application may help. Click on the mixer tab to configure it to your desired settings. Be sure to set your desired output to “mixer” on the output page.
Symptom: Error on launch of Pro Tools: ”Pro Tools could not initialize the current playback device. Please make sure that the device has been configured correctly.” 
Resolution: This could be an issue with the Current Engine setting in the Pro Tools Playback Engine.
This has been resolved in some scenarios by picking a different Playback Engine:
- Launch Pro Tools
- When the splash screen appears on the screen, hold down the “n” key on your keyboard, which will eventually open the Playback Engine dialog for Pro Tools.
- At the top of this window, you will see the ‘Current Engine’ drop-down menu.
- Choose a different Engine (such as Pro Tools Aggregate I/O)
- Click OK.
- This should allow Pro Tools to launch.
If the solution above fails, you can try deleting the “com.apple.audio.AggregateDevices.plist” preference on Mac OS X. You can find this preference file in the following location:
Macintosh HD > Library > Preferences
Symptom: Duet not being recognized by the Mac
- If you’re using the power supply with Duet, please disconnect. It is recommended to only connect via USB unless you are prompted to connect the power supply. This will depend on certain power consumption requirements.
- Disconnect the USB cable from the Duet
- Download the latest Duet software installer here and run it.
- When the software installer asks you to connect a Duet 2, reconnect the USB cable to the Duet while pressing down on the rotary encoder knob.
Using Duet with Avid Pro Tools
(MUST BE USING PRO TOOLS VERSION 9 OR HIGHER)
Choose Setup menu > Playback Engine.
Choose Duet for Current Engine.
Set the Buffer Size to 128. Click OK.
“Why would Apogee use USB rather than Firewire for its recent Mac audio products like Symphony I/O, Duet 2 and ONE?”
Historically, Firewire has been the superior interface audio format on the Mac. However, since the release of OS X 10.6.4, USB Audio is more stable, offers lower latency and provides the ability to connect your audio interface separate from an external audio hard drive on your Mac.
Apple Logic configured at a 96kHz sampling rate and 64 buffer setting, Duet USB’s analog in to analog out latency is 4.2 milliseconds, while Duet Firewire’s latency is 5.3 milliseconds.
Most audio software developers agree that recording audio to an external Firewire hard drive renders the best results. When the audio interface is connected to a different computer port than the audio drive, system performance is more stable. Thus, it’s preferable to use a Firewire hard drive and a USB audio interface.
Yes, Mac OS allows you to use multiple audio devices at once and use them as-if they were a single device. Through a process called Aggregation, inputs and outputs of the separate devices are combined and can be used simultaneously. For example, you can aggregate 2 ONE’s, effectively creating a device with 4 output channels.
Apogee supports device aggregation for a maximum of 2 devices only on Mac OSX 10.7 (Lion) or greater.
Apogee devices that support Aggregation:
- Duet 2
To create an aggregate device and use multiple interfaces simultaneously:
- Open Audio Midi Setup (Located in Applications/Utilities/ on your Mac)
- Click the + from the button left of the window
- Select “Create Aggregate device”
- Double-click the newly created device’s name “Aggregate Device” and rename it if desired
- In the right side of the window, select the devices you wish to aggregate. For example ONE, Built-in Input, Built-in Output.
- For best results, be sure Apogee device is selected as the Master Clock
- In your recording application, select the device name you’ve just created.
- To select this device to be your default for Mac sound, Right click (or control click) the device in Audio MIDI Setup and select “Use this device for sound input/output”
- Select the Output speaker channels by clicking “Configure Speakers”, selecting the stereo tab and assigning destinations for left and right channels
- Select “Done” button and you’re all set.