Symphony I/O: 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

Does Symphony I/O work with versions of Pro Tools HD older than version 9?

Depending on what type of i/o modules your Symphony I/O has and what versions of firmware are loaded on it, it can work with older versions of Pro Tools HD, however we recommend using the latest Symphony I/O firmware along with version 8.1.1 or later of Pro Tools HD since the current Symphony I/O firmware is much more stable than the older versions.

If you need to use the older firmware for the Symphony I/O’s modules to emulate a Digi 192, then please read the information below carefully before requesting the older firmware from our Support department. This firmware is not available on our website.


The following i/o modules can be recognized as either a Digi 192 or an Avid HD I/O and can be used with versions of Pro Tools HD older than version 8.1.1 and all the way up to the current version:

– 8×8 Analog + AES I/O

– 8×8 Analog + Optical I/O

– 8×8 Analog + AES/Optical I/O

– 16 Analog Input + 16 Optical Output

– 16 Optical Input + 16 Optical Output


The following i/o modules can ONLY be recognized as an Avid HD I/O and can NOT be used with any version of Pro Tools HD earlier than version 8.1.1:

– 16×16 Analog In/Out

– 2×6


How do I find the Maestro software on your website?

The Apogee Maestro 2 software is not on the Apogee website as a separate file. Instead, it is installed with the software package for your Apogee interface.

For example, if you download and install the Duet for iPad & Mac software, Maestro 2 will automatically be installed and placed in your Applications folder.

This is true for any Apogee interface software. You can find the appropriate software for your Apogee interface by going to the support section of our website:


Mic Pre Module Frequently Asked Questions

The Mic Pre module provides your Symphony I/O with up to 8 mic preamps to your system. Here are answers to some common questions our customers have about the Mic Pre module:


Q. Does it add 8 additional channels to my system?

A. No. It only provides the option of selecting a mic pre to your existing card in slot 1.

For example: If you have an 8×8 module in slot 1 of your Symphony I/O, this provides you with 8 channels of analog line-level input. If this is the only card you have installed, you’d have to use external mic preamps to connect microphones to this system.

By adding a Mic Pre module in slot 2, this provides those 8 channels with high-quality mic preamps internally instead. Whether to use your 8 analog inputs as line-level or mic preamps is selectable in the Maestro 2 software’s Input screen.


Q. Do I plug my mic into one of the four ¼” inputs on the Mic Pre module? What are they for?

A. These ¼” inputs are for connecting high impedance sources such as an electric guitar, bass guitar, or keyboards to the Mic Pre card. It makes it convenient to connect these ¼” sources to the Symphony instead of using an adapter to plug into the XLR input of the card in Slot 1. Enable these in the Maestro 2 software’s Input screen by selecting “Instrument” as the channel’s Analog Source.


Q. What are the Inserts Send/Return for? How do you use them? Where is the insert point?

A. This is a hardware insert for the Microphone Preamps. They are used to insert additional equipment such as Compressors and Equalizers to your input path. You turn Inserts On/Off via the Maestro 2 software’s Input screen, and the insert option is only visible on channels that have the source set to “Mic” or “Instrument”. The insert point is after the preamp and high-pass filter but before the A/D conversion stage.


Q. Can I use the Mic Pre module with the 2×6 analog card or the 16 Digital In + 16 Analog Out card (sometimes called the 16ch D/A card)?

A. No. The Mic Pre module cannot be used with the 2×6 analog card or the 16 digital in + 16 analog out card because they do not have at least 8 channels of analog input available.


Q. Can I use the Mic Pre module with the 16×16 analog I/O card or 16 Analog In + 16 Digital Out card?

A. Yes. The first 8 channels of the 16 input channels can be set as “Mic” via the Maestro 2 software’s Input screen, and the channels 9-16 are limited to line-level.

Symphony I/O Power Behavior Modification

Can Symphony I/O be set to power on automatically when power to the studio is turned on?



There is a jumper on the Main board internally that can be moved to set the Symphony I/O to turn on automatically when it senses current. The instructions are in the users guide found here:

Symphony I/O User’s Guide

Choose “Symphony I/O Hardware”, then “Auto Power” to find the article.

Symphony I/O Fan modification

The original Symphony I/O chassis uses a thermal sensor and cooling fan to maintain a temperature that helps the Audio Converter cards to provide its amazing and world-renowned audio quality. Since A/D and D/A conversion generates heat, the cooling fan in a Symphony I/Owould spin faster and therefore louder in units equipped with more conversion channels such as a 2nd module card.
As of late 2012, all new units feature a modified chassis design to help maximize air flow, thus helping reduce the fan speed and the amount of time that it is on. For chassis manufactured prior to this design change, Apogee offered a magnetic strip that can be easily attached to the left side of the unit (when viewing from the front) to block the vents, producing the same result as the new modified chassis design.
In early 2015, the fan was changed to the Sanyo Denki 9S0612F401 which some users report is a bit quieter than the previous model. Apogee does not have these available for purchase, but end-users can look for this model on the open market.
A new Symphony I/O MkII chassis was released in 2016 featuring an all new design with front-facing vents over the I/O module cards, and a special new fan that is virtually silent (note this new fan is not compatible with the original Symphony I/O).
Nearly all the original Symphony I/O converter cards are compatible with the Symphony I/O mkII chassis, making it easy to upgrade. See your favorite music gear dealer for pricing. Additional questions about this new model can be directed to our Technical Support Department:

How do I know what version of Maestro is installed on my Mac?

To find out what version of Maestro you have installed:
  • Open Maestro 2 (found in your Mac’s application folder) and click on the “Apogee Maestro 2″ menu in the upper left-hand corner of the desktop menu bar
  • select “About Maestro 2″. This will bring up a window showing you which version you have installed (see example below)