Symphony 64 | ThunderBridge: General

Is Symphony I/O compatible with Mac OS X Yosemite (10.10)?

Yes! Symphony I/O is fully compatible with Mac OS X Yosemite (10.10).  Please be sure to download and install the latest 10.10 compatible software package for Symphony from Apogee’s site.


Click to find the latest Symphony Software Installer

Why is Mac OSX 10.6.8 not supported with Symphony ThunderBridge

The minimum OSX version supported for ThunderBridge is 10.7.5, During development many unsolvable issues unique to 10.6.8 and ThunderBolt were encountered, it was determined that the vast majority of people purchasing Apple’s new Thunderbolt equipped MacBooks and iMacs would not choose to run 10.6.8.

Power Supply Information: Element / Quartet / Thunderbridge

The Apogee Element Series, Quartet, and Thunderbridge require a regulated power supply with the following specifications:

  • Input: AC 100~240V, 50-60Hz (same unit can be used in U.S., Europe, and Asia)
  • Output: DC 12V, 2.5Amps (2500mA), 30Watts
  • Barrel Size: 2.1mm inside diameter x 5.5mm outside diameter
  • Center Pin: Positive

NOTE: If the Apogee unit indicates it can accept a range of voltage, here’s how you calculate this using Quartet as an example:
The Quartet is capable of accepting a power supply with an output range of 9 – 16 Volts. However the Amperage must be enough to equal 30 Watts. Using Ohms Law (Watts / Volts = Amps), a power supply that outputs 9 Volts must also provide 3.33 Amps. Likewise, a power supply that outputs 16 Volts must also provide 1.875 Amps.

Updating Symphony I/O firmware

This article applies to the Original Symphony I/O only, not the MkII.

Note: The updater program is only compatible with OS X 10.6.8 – 10.10. This means you need a Mac running one of these operating systems in order to update your Symphony I/O’s firmware. Once the firmware update is complete, you can plug the Symphony I/O into a newer version of macOS and it will fully function. It is only the updater that needs the older OS.

If you do not have access to such a Mac through a friend, local business, or library and you are in the US or Canada, contact Apogee Support to arrange for the unit to be shipped to Apogee for the update. You are only responsible for getting it to Apogee however you choose, and Apogee will update the unit and ship it back to you for free via standard Ground shipping services. (If you are not in the US or Canada, contact the Apogee Distributor for your region. Be aware additional charges for service may apply if purchased in a different region.)

Before you begin the update process, trash ANY older Symphony installer packages you may have on your computer (desktop, downloads folder, etc.) Old installers can mistakenly trigger ‘firmware mismatch’ warnings.

  1. Download the latest Symphony installer package from our website:
    • Fill out the registration form. For Product, select “Symphony I/O”.
    • For Operating System, select the version on which you will run the fully updated Symphony I/O.
  2. Once you have the DMG file downloaded, open it and inside are many files.
  3. Locate the file “Symphony System” and run it. Follow the prompts to a restart of your computer.
  4. When the computer is back up, open the same DMG file but this time located the “Symphony Software Installer.pkg” and run it. Follow the prompts to another restart of your computer.
    • If on macOS 10.13 High Sierra or newer, make sure you allow the Apogee extension to run or it will not be recognized properly: Read More
  5. Plug in the Symphony I/O via USB to your Mac.
    • If your Mac has USB 3.0, you should first try it with a USB hub (an Apple keyboard with USB ports is the best hub to use if you have one) to do the firmware update… the firmware update will not work on most USB 3.0 ports, so a hub will bring it down to USB 2.0. Note- USB Audio should work fine on USB 3.0 ports.
  6. Power up the Symphony I/O.
  7. Locate the file for “SymphonyIO Firmware” and open it.
    • If the firmware needs an update, copy this newest to a USB memory stick and transfer to a Mac running OS X between 10.6.8-10.10, and connect the Symphony I/O via USB to that Mac to perform the update.
  8. Note any settings you may have made for your Symphony I/O in the Maestro software, as these settings can get reset after an update.
  9. Open the “SymphonyIO Firmware” and update the firmware. Make sure the firmware successfully updates before proceeding to the next step.
    • If the firmware updater gets stuck or doesn’t work, quit the firmware updater app, power off the Symphony I/O, power the Symphony I/O back on and try the update again.
    • You may need to try different USB ports.
    • If the updater says it ‘failed’, click ‘try again’ and run the update again.
    • If you have multiple Symphony I/Os, make sure to update EACH of them by selecting each unit in the drop-down menu of the firmware updater (Symphony I/O 1, Symphony I/O 2, etc.)
    • Once the update finishes, quit the updater and then relaunch it to confirm that the firmware is up to date for each unit.

Once you’ve confirmed that your Symphony I/O’s firmware is up to date, ensure it is in the correct Audio Interface Mode (AIM):

  • Push in and hold down the right-side front-panel encoder knob until you get to the audio mode menu.
  • Let off the knob and then turn it to scroll through the different modes.
  • One the desired mode is selected, push in on the knob again to restart the unit in that mode.
  • Here is a video demonstrating how to change interface modes: Video

If you’re using Symphony I/O with Symphony64 PCIe or Symphony64 Thunderbridge:

Launch Audio MIDI Setup (Applications> Utilities> Audio MIDI Setup). We recommend using Audio MIDI Setup instead of System Preferences Sound.

Make sure that ‘Symphony64′ (PCIe or Thunderbridge) is selected in the left-side column. In the ‘Source’ menu on the right, choose the appropriate port selection depending on how many Symphony I/Os you have. If you have 1 unit, choose ‘Port 1: 32ch’… if you have 2 units, choose ‘Ports 1-2: 64Chs’. Quit Audio MIDI Setup and restart the computer.  Wait until the unit/units sync and stop clicking before launching Maestro. This can take a couple minutes if you’re using 2 Symphony I/Os.



Symphony I/O Release 5 System Requirements

Symphony I/O Release 5 Requirements


 Click here to download Symphony I/O Release 5

Symphony Audio Interface Mode

Requirements to connect Symphony I/O to Apogee Symphony 64 or Mobile PCI cards:

  • Apogee Symphony 64 Thunderbridge or Symphony 64 PCIe card (sold separately)
  • OS X 10.8.5, 10.9.5, and 10.10 and higher (64-bit and 32-bit kernel modes)
  • 2GB memory required, 4 GB recommended


Pro Tools HD Audio Interface Mode

A Symphony I/O based Pro Tools system consists of two independent computer connections: audio (to a Pro Tools HD PCI card) and software control (via USB to an Intel Mac running Maestro 2). In the case where PCI cards are installed in a PowerPC Mac or Windows computer, it’s possible to run Maestro from a separate Intel Mac, such as Mac Mini or MacBook.


Running Symphony I/O in Pro Tools HD mode on a PowerPC Mac requires an older firmware version. You can request this older firmware by emailing: Only the 8×8, 16 Analog In/Digital Out, and 16 Digital In/Analog Out modules are compatible with versions of Pro Tools HD older than version 9. The 16×16 Analog In/Out and 2×6 modules are only compatible with Pro Tools HD versions 9 and above.


Requirements to connect Symphony I/O to Avid Pro Tools PCI Cards:

  • Avid Pro Tools HDX, HD Native or HD Core/Accel/Process card installed in a computer in accordance with the Pro Tools HD Compatibility Grids, available at
  • Pro Tools 8.1 (requires older Symphony I/O firmware), 9.0 or greater, 10.0 or greater, 11.0 or greater

Requirements to run Apogee Maestro software, to control Symphony I/O via USB:

  • OS X 10.8.5, 10.9.5, and 10.10 and higher (64-bit and 32-bit kernel modes)
  • Apple Intel Mac

USB Audio Interface Mode


Requirements to connect Symphony I/O as a USB audio interface:

  • OS X 10.8.5, 10.9.5, and 10.10 and higher (64-bit and 32-bit kernel modes)
  • Apple Intel Mac – 2GB memory required, 4 GB recommended


Standalone Audio Interface Mode

In Standalone audio interface mode, all audio connections are made using the standard analog and digital i/o found on the I/O Module(s). For software control, connects Symphony I/O’s USB port to a Mac.


Requirements to run Apogee Maestro software, to control Symphony I/O via USB:

  • OS X 10.8.5, 10.9.5, and 10.10 and higher (64-bit and 32-bit kernel modes)
  • Apple Intel Mac

Symphony I/O Firmware and Software Installer Release 5


Download Release 5 here.


16x and Rosetta series users, please consult the Legacy Interface Release Notes.


Who should update?

Users running or upgrading to OSX 10.10 Yosemite
New Users setting up their Symphony system for the first time
Users on 10.8.5 or 10.9.5 who would like the new Features and bug fixes
NOTE: Symphony Users who are currently running 10.8.4 or lower and don’t plan to update their OSX should not update to Release 5
New Features
Compatibility with Mac OS X Yosemite and Mavericks (10.10 and 10.9)
with continued support back to OSX 10.8.5
Up to 3 Selectable Speaker Sets can be toggled and controlled from Maestro
Command-click lets you enable multiple speaker sets at the same time
Dim functionality for Main Outputs and Headphone outputs
Sum To Mono functionality for Main Outputs and Headphone outputs
Various bug fixes


Before you update

  • Please note critical Maestro settings such as Trim levels before performing a firmware update.Parameters will be reset after installing new software.
  • Unplug headphones and mute speaker volume before updating firmware.


To update


After updating – After updating, verify the following settings;

  • Audio Interface Mode – press and hold the right hand encoder to verify that Symphony I/O is set to the desired audio interface mode.
  • If using the Symphony 64 card, verify that the Symphony Source setting (found in the Maestro 2 > System Setup tab and Audio MIDI Setup) is set to the appropriate Symphony 64 Port setting:

! ! If interfaces are connected only to Port 1, set Source to Port 1: 32ch.
! ! If interfaces are connected to both Ports 1-2, set Source to Port 1-2: 64ch.

  • Check that Output settings such as Speaker setting and level and headphone level and mute are set as expected.




Are Apogee products compatible with Pro Tools 11?

Yes!  The following products have been tested and are fully compatible with Pro Tools 11 (every version of 11):

  • JAM
  • JAM 96k
  • MiC
  • MiC 96k
  • Groove
  • GiO
  • ONE for Mac (old and new versions)
  • ONE for iPad & Mac
  • Duet FireWire
  • Duet 2
  • Duet for iPad & Mac
  • Quartet for iPad & Mac
  • Ensemble FireWire
  • Ensemble Thunderbolt
  • Symphony I/O (USB, Symphony, and Pro Tools HD modes)
  • Symphony I/O MkII (Thunderbolt and Pro Tools HD)
  • Symphony 64 PCIe
  • Symphony 64 | ThunderBridge
  • X-Symphony equipped X-Series and Rosetta Series Converters
  • X-HD equipped X-Series and Rosetta Series Converters