Controlling Ada-8Xrs From The Pro Tools|Hd User-Interface; Input And Output Routing; Sample Rate; Sync Source - Prism Sound ADA-8XR Module Reference

Multi-channel a/d d/a converter

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Prism Sound ADA-8XR Multi-channel A/D D/A Converter

Module Reference - Revision 1.01

For information about synchronization in systems combining ADA-8XRs with Digidesign 96

and 192 I/O interfaces, see also section 7.10.

7.8 Controlling ADA-8XRs from the Pro Tools|HD User-Interface

Certain parameters of the ADA-8XR are controlled remotely from the Pro Tools|HD user-

interface as described below. Because the ADA-8XR is emulating a 192 I/O, and because the

capabilities of the ADA-8XR and 192 I/O are not identical, some functions are not supported

and others do not operate in the same way as with a 192 I/O.

The input and output port assignment menus in the 'Main' tab of the 'Hardware Setup'

dialogue box is not supported by ADA-8XRs. In the case of an ADA-8XR, the input and

output ports always appear in the nominal fixed order on the channels of the emulated 192

I/O. For ADA-8XRs with analogue and digital outputs, the digital outputs always appear in

parallel with their respective analogue outputs. The routing matrices in the 'I/O Setup'

dialogue box operate in the usual way.

In common with Digidesign I/Os, the sample rate of connected ADA-8XRs is automatically set

according to the rate of the loaded session. ADA-8XRs support a maximum sample rate of

192kHz.

ADA-8XRs can be nominated as Loop Sync masters in the usual way (using the 'Clock

Source' selection in the 'Hardware Setup' dialogue box), and can be set to provide system

sync from one of their external sync (e.g. WCK or AES11) or digital audio (e.g. AES3) inputs.

Note that in the latter case, when a specific pair of digital input channels is selected from the

drop-list, the ADA-8XR remains in its 'Auto' mode (not provided in Pro Tools|HD), wherein it

takes sync from any AES3 carrier input which is active - in most cases this is more versatile.

However, if a specific AES3 carrier must be nominated, this can be done manually through

the ADA-8XR's menu system. For more details see section 7.7.6. and the ADA-8XR

Operation Manual.

Suitably-equipped ADA-8XRs allow selection of the digital or analogue input on a per-channel

basis. Since the Pro Tools|HD user-interface does not have a specific analogue/digital input

channel selection, the 'Reference Level' selection in the 'Analog In' tabs of the 'Hardware

Setup' dialogue box is 'hijacked' for this purpose when an ADA-8XR is connected. For each

channel, clicking '+4dBu' selects the analogue input, clicking '-10dBV' selects the digital input.

The 'Soft Clip' selection in the 'Analog In' tabs of the Hardware Setup' dialogue box enable

and disable the Overkillers (progressive limiters) in the analogue inputs of the ADA-8XRs on a

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