# Connecting to Pro Tools HD PCI Cards

| ##  | ## Pro Tools HD Audio Interface Mode

Connecting to Pro Tools HD PCI cards

When Symphony I/O's Audio Interface Mode is set to Pro Tools HD, one (1) Symphony I/O with up to 32 channels of input and output may be connected to each Pro Tools HD PCI card. Up to 3 Symphony I/Os may be connected.

Connect one end of an Apogee PC-32 (or Avid DigiLink) multichannel cable to the Symphony I/O Main port and the other end to a Pro Tools HD PCI Core card, as shown below. Connect additional Symphony I/Os to additional HD PCI cards.

The following Pro Tools HD PCI cards are supported.

- HD Core

- HD Process

- HD Accel PCI

- HD Accel Core

- HD Accel PCIe

- HD Native (see below)

Connecting to Pro Tools HD Native cards

When Symphony I/O's Audio Interface Mode is set to Pro Tools HD, one (1) Symphony I/O with up to 32 channels of input and output may be connected to each port of a Pro Tools HD Native PCI card. Connect one end of an Apogee PC-32 (or Avid DigiLink) multichannel cable to the Symphony I/O Main port and the other end to Port 1 of the HD Native PCI Core card. Connect a second Symphony I/O to Port 2.

PC-32 cable lengths of up to 30 meters between the Mac and Symphony I/O are supported at sample rates of 44.1-96 kHz. Lengths up to 5 meters are supported at sample rates of 176.4-192 kHz.

To incorporate Avid interfaces (192 I/O, 192 Digital I/O, 96 I/O, HD I/O) with one or more Symphony I/Os in a Pro Tools HD or HD Native system, the following guidelines should be followed:

1. Connect Symphony I/Os and Avid interfaces to different PCIe card ports.

2. Connect Symphony I/O's Loop Sync inputs and outputs with Avid interfaces as described in Making Hardware Clock Connections (Locking Multiple Symphony I/Os with Loop Sync).

3. It's recommended to connect Symphony I/O to the first PCIe card port and choosing it as the Loop Master, thus making it the clock master of the system.

## Apogee Maestro Software Control via USB

A USB connection between Symphony I/O and an Intel Mac provides the link between Apogee Maestro software and Symphony I/O. See Connecting to a Mac's USB Port for details.

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