The port selection switching back to the wrong setting (port 1 if you’re trying to use 2 ports or ports 1-2 if you’re trying to use 1 port) is caused by a preference file getting corrupted. This can happen from using System Preferences Sound to make your audio selections. We recommend only using Audio MIDI Setup (Applications> Utilities> Audio MIDI Setup) from now on.

To fix this issue, please follow these steps in the exact order:

– Go to the following location:

MacHD> Library> Preferences> Audio

– Once you’re in the ‘Audio’ folder, there should be 2 files in there:

com.apple.audio.DeviceSettings.plist
com.apple.audio.SystemSettings.plist

– Trash both of these files and empty the trash.

– If you still have the Symphony Release Installer package on your desktop or downloads folder, open it. If not, download it from our website and open it.

– Launch the Symphony Uninstaller and run it. Restart your Mac after the uninstall has completed.

– Open the Symphony Release Installer package and run the Symphony Software Installer. Restart your Mac after the install has completed.

– It’s a good idea to connect your Symphony I/O(s) to your Mac via USB and launch the ‘Symphony I/O Firmware Updater’ (Applications> Utilities> Symphony I/O Firmware Updater) just to double-check that your firmware is all on the current versions. If it’s not, update it. If it is, move to the next step.

– 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.