Symphony I/O Installers


If you’re using an M1 Mac, you will need to allow user management of kernel extensions to install the Apogee driver.

  1. Quit this installer and shutdown the Mac.
  2. Press and hold the Mac’s Power button until the display shows Loading Startup Options, then release it. This takes you to the Startup Options screen.
  3. In the Startup Options screen, select the Options icon, then click Continue underneath it.
  4. Once the main window has loaded, select the Startup Security Utility in the Utilities menu. You’ll then be prompted to select the system for which you want to configure startup security. Once you’ve unlocked that disk, click on the button to set startup security for that disk. Then select Reduced Security, and check the upper of the two boxes, which allows user management of kernel extensions.
  5. Quit Startup Security Utility, and select Restart from the Apple menu to restart into normal mode.
  6. Once you’ve restarted, launch this installer again and begin the install. Towards the end of the install, before you restart the Mac, open System Preferences and go to the General tab of the Security & Privacy pane. If you see a message towards the bottom of the window with an Allow button, then unlock the Security & Privacy pane and click the Allow button. If the Apogee installer has finished, restart the Mac.

Current Version

Symphony System Release 5.5 Installer

  • Adds support for macOS 11 Big Sur and higher (Intel and Apple Silicon M1 Macs) for Symphony I/O (original Mk1), Symphony64 PCIe card, and Symphony64|Thunderbridge
  • This installer is not compatible with macOS 10.15 or lower. Use previous Release installers for older macOS versions.

System Requirements for Mac

  • Apple Mac computer with built in Thunderbolt connector
  • macOS 11.0 or higher
  • 4 GB minimum RAM, 8 GB or higher recommended


Permission to run Apogee System Extension MUST be allowed in macOS Security & Privacy – DO NOT SKIP THIS STEP – Read More


Nothing has been changed since the previous Symphony Release, other than support for macOS 11.0 and Apple M1. If your Symphony I/O is already on the latest firmware, there is no firmware update required. If your Symphony I/O is using older firmware, you will need to download the Symphony I/O Firmware Updater from the previous Release 5.4c Installer package and use an Intel Mac running macOS 10.10.5 or earlier (10.6.8 – 10.9 recommended) with USB 2.0 ports to update the firmware, as the firmware updater app is not compatible with any version of macOS newer than 10.10.5.


  • I/O level controls for Symphony I/O do not work from Audio MIDI Setup, System Preferences Sound, or the Keyboard Volume Control.
  • Clock Source menu no longer available in Audio MIDI Setup. Must use controls in the Maestro 2 software.
  • GUI graphical anomalies in Maestro 2 software

Previous Version

Symphony System Release 5.4c Installer

  • Compatible with macOS 10.15 Catalina, 10.14 Mojave, 10.13 High Sierra, 10.12 Sierra, 10.11 El Capitan, 10.10 Yosemite, 10.9 Mavericks
  • Includes Apple’s Notarization requirements required for macOS 10.15 Catalina. All other features are the same as previous 2.5 version.


1) To properly install this update, you must run this installer TWICE. The first time you install you are authorizing the kernel extension on your Mac (see #2). When the computer restarts after the first install, run the installer again to complete the installation of the update. 

2) *macOS 10.15, 10.14 & 10.13 – Please make sure that after installing you have done this important Security step and Restarted the computer. This will allow the Apogee Driver to run so your device will be recognized properly – Read More

Please Note: Symphony I/O is compatible with macOS 10.15 and lower. However the firmware can only be updated using macOS 10.10 or lower (10.6.8 – 10.9 preferred). You may use the Firmware Updater from the v5.4 download on the older OS to execute the update.

Symphony System Release 5 Installer – Mac OS X 10.8.5
Mac OS X 10.8.5 only
New Features:
Up to 3 switchable speaker sets can now be controlled via Maestro Software
Dim functionality for Main Speaker and Headphone Outputs
Sum to Mono functionality for Main Speaker and Headphone Outputs

Symphony System Release 4.8 Installer – OS X 10.9 Maverick
Mac OS X 10.9 only
Fixes issue with some units having jumpy Output encoder knob

Symphony System Release 4.8 Installer – OS X 10.8 and lower
Fixes issue with some units having jumpy Output encoder knob

Symphony System Release 4.6 Installer – OS X 10.9 Mavericks

Symphony System Release 4.6 Installer – OS X 10.7.5 / 10.8.5

Symphony System Release 4.4 installer
Compatible with Mac OS X 10.6.8, 10.7.4, 10.7.5, 10.8.2 and later
Intended for all Symphony I/O users
Required for Symphony I/O systems equipped with the 2×6 Analog Module
Supports X-Series and Rosetta Series interfaces
Known Issue: The firmware updater is not compatible with USB 3 ports on recently introduced Macs.
Workaround – connect Symphony I/Oʼs USB port to a USB 2 hub (including a Mac keyboard), then connect the hub to the USB 3 port
When updating firmware with OS X Mountain Lion, the OS must be updated to version 10.8.2
**Please see the Release Notes for detailed information about who should update, new features and known issues**