About This Page
This page is dedicated to compatibility and support of the Thunderbolt Option Cards for Apollo and Apollo 16 with Mac OS X. The following information is subject to change and may not always be up to date due to OS updates or other factors beyond Universal Audio's control.
Last Updated: November 12, 2014Jump to:
Latest Technical News
Please review the information on this page carefully before using Apollo or Apollo 16 with Thunderbolt.
- For compatibility information about Mac OS X Yosemite, click here.
- Info on this page applies to both Apollo and Apollo 16. All references to "Apollo" on this page apply to both Apollo and Apollo 16 unless specifically noted otherwise (Apollo Twin has its own support page).
- Thunderbolt PCIe audio drivers for Apollo are available now. For optimum performance when connecting via Thunderbolt, the latest Apollo Thunderbolt software is recommended.
Important: Thunderbolt PCIe audio drivers disable Apollo's FireWire ports. For details, click here.
- For important information about Apple Mac Pro (Late 2013) compatibility, click here.
Thunderbolt Option Card Information
Thunderbolt Option Cards
- There are two versions of the Thunderbolt Option Card: The original (discontinued but still compatible) Thunderbolt Option Card introduced in October 2012, and the newer Thunderbolt 2 Option Card introduced in July 2014.
- Both cards have the same behavior, with the exceptions detailed below.
About Thunderbolt Option Card documentation
This page contains all documentation related to the Thunderbolt Option Cards (there is no separate manual). Please review the information on this page carefully before installing or using the device.
Thunderbolt Option Card product information
- Main product page – General product information
- Thunderbolt FAQ – Frequency asked questions
- Apollo support page – Most items on the Apollo support page still apply when using Thunderbolt
- Thunderbolt 2 Information – How it compares to Thunderbolt 1
- Thunderbolt Option Card comparison – Differences between the two option cards
Thunderbolt System Requirements (Mac only)
- Apple Mac computer with available Thunderbolt or Thunderbolt 2 port
- Mac OS X 10.8.5 Mountain Lion or 10.9.x Mavericks
- Internet connection to download software and authorize UAD plug-ins
- Compatible VST, Audio Units, RTAS, or AAX 64 plug-in host DAW software
- 4 gigabytes available disk space
- Thunderbolt cable (sold separately)
- For information about Apple Mac Pro (Late 2013) compatibility, click here.
- Thunderbolt-equipped Windows PC computers are not compatible.
Thunderbolt Option Card Installation
Installing the Thunderbolt Option Cards
Note: As of July 2014, all Apollo and Apollo 16 interfaces ship from the factory with the Thunderbolt 2 Option Card pre-installed.
- Important installation note: When removing or replacing Apollo's expansion bay cover plate screws,* take precautions to ensure the screw head sockets do not strip by inserting the hex wrench* deeply into the screw head before rotating the screws.
*4-40 x 1/4” button head cap screws, 1/16” hex wrench
- The Thunderbolt Option Cards are designed for easy installation by the user. Detailed instructions are provided in the printed Installation & Setup Guide in the retail package. To download the Installation & Setup Guide, click here.
Note: Instructions are the same for the original Thunderbolt Option Card and the newer Thunderbolt 2 Option Card.
- For a YouTube video showing how the Thunderbolt Option Card is installed into Apollo, click here.
Note: This this video is from the Winter 2012 NAMM trade show floor where the product was first announced, and shows a prototype card that has an OFF/ON switch. There is no switch on the shipping version of the card.
Apollo Thunderbolt Software (Mac only)
Thunderbolt PCIe audio drivers for Apollo and Apollo 16
- Apollo Thunderbolt software uses Thunderbolt PCIe audio drivers for Apollo and Apollo 16. FireWire drivers are not included.
- PCIe audio drivers provide high-bandwidth, low-latency Apollo performance with all Thunderbolt-equipped Macs.
- This feature uses the PCIe protocol via Thunderbolt for all audio I/O and UAD plug-in processing. Because FireWire audio drivers are not included, Thunderbolt must be used for Apollo’s connection to the computer (the Apple Thunderbolt to FireWire Adapter cannot be used to connect Apollo to the computer when using Apollo Thunderbolt software).
Apollo firmware determines the operating mode
Important: All Apollo and Apollo 16 units ship with FireWire firmware so they can be connected and used with FireWire computers that do not have Thunderbolt ports. Be sure to install the Apollo Thunderbolt software and firmware to enable the latest Thunderbolt features and functionality.
- Apollo's firmware determines whether the system operates in Thunderbolt mode (PCIe audio drivers), or FireWire mode (FireWire audio drivers). Apollo firmware is contained within the UAD Powered Plug-Ins software installer.
- To obtain the Apollo Thunderbolt software (and the matching firmware), choose "Apollo & Apollo 16 - Thunderbolt"
from the "Select your Product" drop menu on the software download page.
- To update the Apollo firmware, be sure to click "Load" when prompted by the UAD software.
Note: To trigger the firmware update, connect and power Apollo before beginning Apollo Thunderbolt software installation. If Apollo Thunderbolt software was installed when Apollo was not connected and powered, open the UAD Meter & Control Panel application after installing the software and connecting/powering Apollo. For complete details about changing firmware, visit the firmware support page.
Important: Apollo Thunderbolt software disables the FireWire ports on Apollo and Apollo 16
After loading the required firmware contained in Apollo Thunderbolt software:
- Apollo cannot be connected to the computer via FireWire
- FireWire devices cannot be connected to the Apollo FireWire ports
- UAD-2 Satellite and other FireWire devices must be disconnected from Apollo’s FireWire ports
- UAD-2 Satellite and other FireWire devices can be connected to other FireWire ports, such as a:
- FireWire port on the Mac (if available)
- Thunderbolt port via the Apple Thunderbolt to FireWire Adapter
- Thunderbolt hub that has a FireWire port
Reverting to FireWire connectivity
To reactivate the ability to connect Apollo to the computer via FireWire (and/or to reenable the Apollo FireWire ports), the Apollo software and firmware must be downgraded to a version that supports FireWire.
Important: The firmware downgrade must be performed while Apollo is connected to a Mac computer via Thunderbolt. The firmware cannot be downgraded while connected via FireWire.
To revert Apollo to FireWire connectivity:
- Connect Apollo via the Thunderbolt Option Card to a Thunderbolt-equipped Mac computer.
- Power on Apollo so it will be recognized during UAD software installation.
- Download Apollo FireWire software by choosing "Apollo & Apollo 16 - FireWire" from the "Select your Product" drop menu.
- Launch the downloaded UAD installer for FireWire and click through the screens to begin installing the software.
- During installation, the UAD software will prompt to downgrade the Apollo firmware. Click the "Load" button in firmware downgrade dialog window to initiate the process.
- After the firmware is installed, the "Power Off UAD Device" window appears. Power off Apollo using the front panel switch, then power it back on. The FireWire firmware is now installed.
- Click "OK" in the Power Off UAD Device dialog window to allow software installation to finish.
- Restart the computer when prompted by the software installer.
Apollo's FireWire ports are reactivated and the unit can now be connected to Mac or Windows computers via FireWire using Apollo FireWire software.
Combining UAD devices
UAD devices can be combined in a single Thunderbolt computer with the following limitations:
- Maximum of four UAD devices
- Different Apollo hardware models (Apollo, Apollo 16, Apollo Twin) cannot be connected simultaneously
- One UAD-2 Satellite can be used (via the Apple Thunderbolt to FireWire Adapter or via a FireWire port on the computer, if available)
- Two Apollo units can be used simultaneously (see multi-unit cascading below)
- Two Apollo 16 units can be used simultaneously (see multi-unit cascading below)
- To use UAD-2 PCIe card(s), a compatible Thunderbolt to PCIe chassis must be used
Thunderbolt Device Compatibility
- The Thunderbolt Option Card is officially certified as Thunderbolt compliant and is therefore compatible with other certified Thunderbolt devices when used in the same chain.
- The Startech Thunderbolt Docking Station is tested in-house and is known to be compatible with the Thunderbolt Option Cards. This device has an HDMI display output which can be used for an external display to free the second Thunderbolt Option Card port for other devices.
Connecting Apollo to the computer
- Connect Apollo to the computer with a Thunderbolt cable (sold separately) using either option card port.
- See the Multi-Unit Cascading section below for specific instructions on how to connect and use two Apollo units together via Thunderbolt.
- Universal Audio Thunderbolt devices are tested with authentic Apple Thunderbolt Cables and Thunderbolt Optical Cables by Corning. Using off-brand cables may cause unpredictable results.
Software co-install for different Apollo hardware models
- The latest Apollo Thunderbolt software is compatible with all Apollo hardware models (Apollo DUO, Apollo QUAD, Apollo 16, and Apollo Twin).
- Connecting different Apollo hardware models to the computer simultaneously is not currently compatible.
- Console sessions are not interchangeable between different Apollo hardware models.
- Console sessions and Console Recall created in Apollo Thunderbolt software cannot be loaded with Apollo FireWire software (Console data is not backwards compatible).
Connecting additional Thunderbolt peripherals
- Thunderbolt peripheral devices can be connected (daisy-chained) to the available port of the Thunderbolt Option Card.
- Per the Thunderbolt specification, bus power is supplied to downstream (daisy-chained) peripheral devices. However, Apollo must be powered for the computer to recognize the daisy-chained device.
Thunderbolt and Mini DisplayPort
- The Thunderbolt Option Card cannot be used by connecting it to a Mini DisplayPort connector. Although Thunderbolt and Mini DisplayPort devices have the same physical connector, the underlying communication protocol used by these devices is different.
- The type of device port can be determined by the icon next to the port. Thunderbolt ports have a "lightning bolt" icon, while Mini DisplayPort ports have a "display" icon, as illustrated below.
Apollo behavior with the Thunderbolt Option Card
The specific differences when using Apollo with a Thunderbolt connection versus a FireWire connection are:
- Data for audio I/O and UAD plug-ins used in the DAW is streamed via PCIe instead of FireWire. Therefore FireWire bandwidth limitations no longer apply, and higher UAD plug-in instance counts can be achieved (within the constraints of available UAD DSP).
- The minimum processing buffer of 512 samples for UAD plug-ins streamed via FireWire no longer applies. PCIe can use smaller buffers, therefore latency is reduced for UAD plug-ins used in the DAW.
- FireWire tuning via the UAD Bandwidth Allocation parameter is no longer applicable. The FireWire panel in the UAD Meter & Control Panel application does not appear when Apollo is connected via Thunderbolt, so the parameter is unavailable. Similarly, the FireWire bandwidth gauge in the UAD Meter does not appear.
- LiveTrack mode is available for UAD plug-ins used in the DAW. When enabled, LiveTrack mode reduces UAD processing latency via PCIe even further. LiveTrack is useful when playing virtual instruments through UAD plug-ins.
Note: Specific FireWire behaviors still apply when UAD-2 Satellite is connected. See "Using UAD-2 Satellite with the Thunderbolt Option Card" below for details.
General usage notes
- Most items on the Apollo support page still apply when using Apollo via Thunderbolt. The main exception is that items in the Optimizing FireWire Performance section on that page do not apply when connected via the Thunderbolt Option Card.
- For optimum results, connect and power Apollo and all Thunderbolt and FireWire peripherals before starting the computer. See the "Powering Apollo" section on the Apollo support page for details.
- Although Thunderbolt has much higher data bandwidth compared to FireWire 800 (dual 10 Gigabit lanes for Thunderbolt 1 versus 800 Megabits for FireWire 800), it is still possible to run out of Thunderbolt bandwidth. This can occur when very high-bandwidth Thunderbolt peripherals such as high-performance RAID storage arrays, multiple Thunderbolt and/or 4K displays, and similar devices are connected in the same Thunderbolt chain.
- Bandwidth considerations are especially a factor at high session sample rates.
System sleep is supported with the Thunderbolt Option Card and Apollo Thunderbolt software. However, disabling sleep when using DAW software is generally recommended. For optimum results when using Apollo with DAW software, follow these guidelines:
- Disable sleep. Open the System Preferences*>Energy Saver panel and drag the “Computer Sleep” slider (if present) to “Never” (the far right position).
- Before sleeping the system, quit any DAW software using UAD plug-ins.
- If UAD-2 Satellite is connected, system sleep MUST be disabled. Sleep is not compatible with UAD FireWire devices.
*System Preferences.app is located in Macintosh HD/Applications/Utilities, or click the Apple icon in the Menu Bar (upper left of screen) then select “System Preferences” from the Apple Menu.
Using UAD-2 Satellite with the Thunderbolt Option Card
- When UAD-2 Satellite is connected (via a FireWire port on the computer or the Apple Thunderbolt to FireWire Adapter) to the same system as a Thunderbolt-connected Apollo, the following conditions apply:
1. UAD plug-ins in the DAW loaded on UAD-2 Satellite stream via FireWire, while those loaded on Apollo stream via PCIe.
2. FireWire tuning with the UAD Bandwidth Allocation parameter is applicable for UAD plug-ins running on UAD-2 Satellite. Since UAD plug-ins in the DAW that are loaded on Apollo still stream via PCIe in this configuration, FireWire tuning is applicable only for those UAD plug-ins running on UAD-2 Satellite.
3. A minimum processing buffer of 512 samples for UAD plug-ins in the DAW applies for UAD-2 Satellite.
- Realtime UAD Processing is always available for Apollo's inputs via the Console application, regardless of configuration (even when I/O buffer values are high and/or when UAD-2 Satellite is connected).
Thunderbolt-to-PCIe Expansion Chassis Compatibility
About Thunderbolt-to-PCIe Expansion Chassis Compatibility
Specific Thunderbolt-to-PCIe expansion chassis products (listed below) are tested in-house to verify compatibility with UAD-2 PCIe cards.
Thunderbolt Chassis Operation Notes
- UAD devices are compatible with Thunderbolt only when using Mac OS X. UAD devices are not compatible with Thunderbolt when using Windows operating systems.
- For optimum UAD performance with Thunderbolt-to-PCIe expansion chassis products, connect and power all Thunderbolt devices before the computer is powered on.
- For optimum Thunderbolt performance, Mac OS X 10.8.2 Mountain Lion (or higher) is recommended.
- For Thunderbolt 2 information, see the section below.
Tested Thunderbolt-to-PCIe Expansion Chassis Models
The specific Thunderbolt-to-PCIe expansion chassis models from manufacturers listed below have been tested with UAD-2 PCIe cards. The results of these tests are noted beneath the specific models.
Note: The chassis models below are individually tested to work with UAD-2 cards. Using chassis models from different manufacturers together in the same Thunderbolt chain is an untested configuration.
- Echo Express Thunderbolt Expansion Chassis for PCIe Cards (one slot)
- Echo Express Pro Thunderbolt Expansion Chassis for PCIe Cards (2 slots)
- Echo Express SE II Thunderbolt 2 Expansion Chassis for PCIe Cards (2 slots)
- Echo Express III-D Thunderbolt 2 Expansion Chassis for PCIe Cards (3 slots)
Status: Compatible. All of the above chassis models are tested in-house for use with UAD‑2 PCIe cards. Although other Thunderbolt-to-PCIe chassis models from Sonnet Technologies are not specifically tested, we are not currently aware of any issues with the other chassis models from this manufacturer.
- ExpressBox 1T One-Slot Thunderbolt to PCI Express Expansion Chassis
- ExpressBox 3T Three-Slot Thunderbolt to PCI Express Expansion Chassis
Status: Compatible. Both of these chassis models are tested in-house for use with UAD‑2 PCIe cards.
Thunderbolt 2 Information
Apollo and Apollo 16 are compatible with both Thunderbolt 1 and Thunderbolt 2
- The original Thunderbolt Option Card, and the newer Thunderbolt 2 Option Card, can be connected to Macs that have Thunderbolt 1 or Thunderbolt 2 ports.
- Thunderbolt 2 technology is designed for backwards compatibility with Thunderbolt 1.
- Apollo can be connected to Mac computers that have Thunderbolt 1 ports or Thunderbolt 2 ports.
Apple computers with Thunderbolt 2 ports
The following Apple computer models include Thunderbolt 2 ports:
- Mac Pro (Late 2013)
- 13" and 15" MacBook Pro with Retina Display (Late 2013) and newer models
- iMac with Retina 5K display
- Mac mini (Late 2014)
Thunderbolt 2 compared to Thunderbolt 1
- The primary benefit of Thunderbolt 2 is to facilitate the use of 4K video displays. In general practice, there are no other operational advantages.
- Thunderbolt 2 and Thunderbolt 1 have the same total amount of bandwidth (20 Gbps). Thunderbolt 1 has two 10 Gbps lanes while Thunderbolt 2 has one 20 Gbps lane.
- 4K video requires more than 10 Gbps (but less than 20 Gbps) at video refresh rates higher than 30 Hz. Thunderbolt 2 enables the increased bandwidth needed to deliver 4K video resolutions at 60 Hz refresh rates.
- Adding a Thunderbolt 1 device to a Thunderbolt 2 chain will cause subsequent Thunderbolt 2 devices in the chain to use Thunderbolt 1 protocol.
- In general, if 4K resolutions at high video refresh rates aren’t required, Thunderbolt 1 bandwidth is more than capable for even the largest audio production needs.
Enabling 4K video with Thunderbolt 1
With Thunderbolt 1 devices such as Apollo with the original Thunderbolt Option Card, or a Thunderbolt 1 chassis connected to a Mac Thunderbolt 1 or 2 port, it is still possible use 4K displays. This can be achieved in the following ways:
- MacBook Pro with Retina Display: Use the dedicated HDMI port, which supports 4K resolutions. The maximum refresh rate is 30 Hz in this configuration.
- Mac Pro (Late 2013): The new Mac Pro features three pairs of dual Thunderbolt 2 ports (six ports total on three buses), and also a dedicated HDMI port. Use a dedicated Thunderbolt bus for 4K displays and a separate bus for Thunderbolt 1 peripherals, or plug directly in to the dedicated HDMI port.
- Note that 4K displays can be used with Thunderbolt 1 Macs, however the video refresh rate is limited to 30 Hz.
For information about Universal Audio compatibility with the Mac Pro (Late 2013), click here.
Thunderbolt Option Card Details
Thunderbolt Option Card types
There are two versions of the Thunderbolt Option Card: The original (discontinued but still compatible) Thunderbolt Option Card introduced in October 2012, and the newer Thunderbolt 2 Option Card introduced in July 2014. Both cards have the same behavior, with the exceptions detailed in this section.
Determining the Thunderbolt Option Card type
The type of card can be determined by a visual inspection of the text on the card's mounting plate. The original Thunderbolt Option Card has port numbers silkscreened on the plate ("PORT 1" and "PORT 2"), while the newer Thunderbolt 2 Option Card does not have port numbers, as shown below. Also, the ports are slightly recessed on the Thunderbolt 2 Option Card.
Differences between the two option card types
- The Thunderbolt 2 Option Card supports the Thunderbolt 2 protocol for use with 4K display monitors.
Note: This card is fully compatible and compliant with Thunderbolt 1 ports and devices.
- The Thunderbolt 2 Option Card does not contain FireWire circuitry.
Important: This card is not recognized by Apollo FireWire software (FireWire audio drivers).
- All operational differences are summarized in the table below.
|Thunderbolt Option Card
|Thunderbolt 2 Option Card
|Compatible Universal Audio Products||Apollo DUO
|Compatible with Thunderbolt 1 Macs?||Yes||Yes|
|Compatible with Thunderbolt 2 Macs?||Yes||Yes|
|Minimum UAD Powered Plug-Ins version||UAD v6.3.1 and higher
(FireWire or Thunderbolt versions)
|UAD v7.7.1 and higher
(Thunderbolt versions only)
|Minimum Mac OS X version||Mac OS X 10.6.8
Snow Leopard (no longer tested)
|Mac OS X 10.8.5
|Apollo Thunderbolt software compatible?
(PCIe audio drivers)
|Apollo FireWire software compatible?
(FireWire audio drivers)
|Connect to Mac via Thunderbolt 1 or 2 using
Apollo Thunderbolt software (PCIe audio drivers)?
|Connect to Mac via Thunderbolt 1 or 2 using
Apollo FireWire software (FireWire audio drivers)?
|Connect to Mac via FireWire using
Apollo FireWire software (FireWire audio drivers)?
|Connect to Mac via FireWire using
Apollo Thunderbolt software (PCIe audio drivers)?
|Apollo's FireWire ports active when connected
to Mac via Thunderbolt 1 or 2?
|Yes, with Apollo FireWire software
(FireWire audio drivers)
|Connect UAD-2 Satellite to the same Thunderbolt bus
as Apollo via the Apple Thunderbolt to FireWire Adapter?
|Connect UAD-2 Satellite to Apollo's FireWire ports when
connected to Mac via Thunderbolt 1 or 2?
|Yes, with Apollo FireWire software
(FireWire audio drivers)
Multi-Unit Cascading via Thunderbolt
Note: This section only applies when connecting to the computer via Apollo Thunderbolt software. If connecting Apollo to the computer via FireWire, see the Apollo support page for multi-unit cascading information.
About Multi-Unit Cascading
- Multi-unit cascading is available for a maximum of two Apollo or Apollo 16 units.
- If using Apollo Thunderbolt software, both units must have the Thunderbolt Option Card installed. Note: Any combination of the original Thunderbolt Option Card or the newer Thunderbolt 2 Option Card can be used when multi-unit cascading (there are no operational differences).
- Combining Apollo with Apollo 16 in one computer system is an incompatible configuration.
- Combining Apollo or Apollo 16 with Apollo Twin in one computer system is an untested configuration.
- Three or more Apollo devices cannot be combined in one computer system.
- For all details and complete operating instructions with two Apollo units, see "Chapter 6: Multi-Unit Cascading" in the Apollo Software Manual.
Multi-Unit Cascading: Wiring
- In all multi-unit cascading setups, specific hardware wiring connections are required. The specific connections differ for Apollo and Apollo 16. See the wiring diagrams below.
- Connect only the monitor unit to the host computer. The expander unit is connected (daisy-chained) to the monitor unit only, not the host computer.
- A Word Clock cable (75-ohm BNC cable) must be connected from the Word Clock Out on the Monitor unit to the Word Clock In on the Expander unit. Note: This connection replaces the FireWire cable that may be indicated in some editions of the printed Apollo Hardware Manual included in the retail package (the FireWire cable is not required with Apollo Thunderbolt software).
- ADAT (Apollo) or MADI (Apollo 16) is required for the mix bus integration when multi-unit cascading.
- (Apollo) Both ADAT ports (S/MUX) must be connected when multi-unit cascading at sample rates of 88.2 kHz or 96 kHz.
- (Apollo) Monitor, headphone, and auxiliary outputs must be connected to the Monitor unit only.
- (Apollo 16) Monitor and cue outputs must be connected to the Monitor unit only.
- Wiring diagrams for both possible Thunderbolt multi-unit cascading setups are below.
Multi-Unit Cascading: Wiring Diagrams
- Apollo multi-unit wiring - Thunderbolt host connection
- Apollo 16 multi-unit wiring - Thunderbolt host connection
Multi-Unit Cascading: Power Up Sequence
When multi-unit cascading, the order in which the Apollo monitor and expander units are powered on is important for proper initialization. For optimum results, follow the recommended power up sequence:
- Shut down (power off) the host computer system
- Power off all connected devices (Apollo, UAD-2 devices, hard drives, etc.)
- Confirm monitor/expander designations and all device wiring (see "Multi-Unit Cascading: Wiring" section above)
- Power on all external devices except Apollo
- Power on the Apollo monitor unit
- Power on the Apollo expander unit
- Start the host computer
Multi-Unit Cascading: Clocking
- Internal clocking:
- When the Apollo units are properly wired, all system clocking and clock settings are automatically configured by the device drivers.
- In the Interface panel of the Console Settings window, set the clock source to Internal unless specifically clocking to an external (non-Apollo) device.
- When the clock source in the Console Settings window is set to Internal, “EXT” will illuminate on the designated expander unit hardware’s front panel.
- When using an external clock with Apollo multi-unit cascading, both Apollo units are automatically configured by the device drivers to use the external clock when the Clock Source specified in the Interface panel of the Console Settings window is set to External.
- When the clock source in the Console Settings window is set to External, “EXT” will illuminate on the front panel of both the monitor unit and the expander unit.
Multi-Unit Cascading: Operation Notes
- To facilitate Realtime UAD Processing and the mix bus integration within the Console Mixer when multi-unit cascading, one device must be designated as the monitor (master) unit and the other as the expander (slave) unit.
- In driver I/O list ordering, the monitor unit I/O precedes the expander unit I/O, and the expander unit I/O labels are preceded with "2" to differentiate from the monitor unit I/O.
- Monitor Outputs: When multi-unit cascading, both units share the same monitor mix bus. The monitoring speaker system must be connected to the monitor outputs of the monitor unit. The monitor outputs of the expander unit are disabled.
- Monitor Knobs: The monitor knob on the front panel of expander unit, and its surrounding green LED ring, are disabled. Use the front panel monitor knob on the monitor unit (or the monitor level controls in Console or the Console Recall plug-in) to adjust the monitor output level.
- Aux, Headphone, Cue Outputs: When multi-unit cascading, the send mix buses of both units are summed and these buses are sent to the monitor unit only. The associated outputs on the expander unit are disabled.
- Flex Routing: When multi-unit cascading, inputs in Console can only be directly routed (via Output menu) to hardware outputs of the same unit.
- Multi-unit cascading is unavailable at sample rates of 176.4 kHz or 192 kHz.
- (Apollo only) Auxiliary bus 2 is unavailable when multi-unit cascading with Apollo.
Multi-Unit Cascading: Driver I/O Complement
- The specific inputs and outputs that are available to the DAW when multi-unit cascading depends on the model (Apollo or Apollo 16) and whether or not PT Mode is enabled.
- Avid Pro Tools allows 32 channels of I/O with non-Avid branded audio interfaces. Because Apollo audio streams exceed this count when multi-unit cascading, some Apollo I/O channels are unavailable in PT Mode when multi-unit cascading.
- Enabling PT Mode changes the driver I/O complement. Quit all audio applications before changing the PT Mode setting.
- PT Mode changes Apollo’s driver I/O numbering and names. If a DAW project saved with PT Mode disabled (or saved prior to UAD v7) is subsequently opened when PT Mode is enabled, the DAW’s channel I/O assignments may need to be adjusted in the Pro Tools I/O Setup window.
- The specific driver I/O complements for all available multi-unit cascading configurations are listed in the driver I/O tables below.
- In the multi-unit I/O driver tables, the designated monitor unit I/O is in the left columns and the designated expander unit is in the right columns. In the tables and the driver I/O labels, the expander unit I/O is prefixed with the number 2 (e.g., “2 LINE 1”).
Multi-Unit Cascading: Driver I/O Tables
Note: All driver I/O tables are available in the Apollo Software Manual.