System Configuration : System Setup : Configuring Avid HDX, Pro Tools|HD, and HD Native Hardware Settings : Configuring 192 I/O and 192 Digital I/O Controls

Configuring 192 I/O and 192 Digital I/O Controls
To configure controls for a 192 I/O:
1 With the 192 I/O selected in the Peripherals list, click the Analog In tab for the following options:
*   
You can set your operating level on a channel-by-channel basis by selecting Reference Level +4 dBu or –10 dBV. These settings correspond to two different input connectors on the back of the 192 I/O. See the 192 I/O Guide for more information.
*   
Each of the analog channels in the 192 I/O has two Input Trims, labeled A and B, for precisely calibrating and switching levels. You can select Input Trim A or B on a channel-by-channel basis. See the 192 I/O Guide for more information.
*   
You can select Soft Clip on a channel-by-channel basis. The Soft Clip limiter attenuates the incoming analog signal, providing extra protection from temporary clipping transients that can cause digital distortion when they exceed the maximum input of the unit. With Soft Clip enabled, 192 I/O supports an additional 4 dB of headroom by rounding off the top 4 dB to the clip point. This is useful for eliminating stray transients.
 
2 Click the Analog Out tab. Each of the analog channels in the 192 I/O has two Output Trims, labeled A and B, respectively. You can select Output Trim A or B on a channel-by-channel basis.
 
To configure controls for a 192 Digital I/O or 192 I/O with an optional Digital I/O card:
*
On the 192 Digital I/O or a 192 I/O with an optional Digital I/O card, click the Digital tab to set the Input Format (AES/EBU, TDIF, or ADAT Optical) and enable real-time sample rate conversion (in channel pairs, with the SR Conversion option).
*
At session sample rates above 48 kHz, sample rate conversion for the TDIF and Optical (ADAT) inputs on the Digital I/O card is automatically enabled on all eight inputs of the selected format.