Installation guide
Chapter 4: Connecting Your Studio 37
Using the 1622 I/O Interface
as Standalone Audio
Converter
The 1622 I/O can be used apart from Pro Tools
as a standalone 2-channel, 20-bit analog-to-dig-
ital, or 24-bit digital-to-analog converter.
Input and output levels are determined by the
settings last saved by clicking the Store button
in the Other Options dialog (choose Setups >
Hardware and click Other Options).
There are no panning controls in standalone
mode. Odd-numbered channels are hard-
panned left and even-numbered channels hard-
panned right. Mono instruments will play out
of output L or R, but not both. Stereo instru-
ments will play out of both outputs L and R.
Output gain must be controlled directly from
connected instruments.
Before you use the 1622 I/O in standalone mode:
1 Turn off the 1622 I/O.
2 Do not turn on your computer while the
1622 I/O is in standalone mode. If you do, the
1622 I/O will stop operating in standalone
mode.
To use the 1622 I/O as a standalone A/D
converter:
1 Turn off any digital devices that may send a
word clock signal to the 1622 I/O S/PDIF digital
input.
2 Turn on the 1622 I/O. The 1622 I/O searches
briefly for a word clock signal on channels 1–2
of its digital input ports.
3 If the 1622 I/O does not detect word clock, it
functions as a standalone A/D converter using
its internal clock. In this mode you will use an-
alog inputs 1–16 and the S/PDIF output.
To use the 1622 I/O as a standalone 24-bit D/A
converter:
1 Make sure that a digital device providing a
word clock signal is connected to the S/PDIF in-
put of the 1622 I/O and that the device is pow-
ered on.
2 Turn on the 1622 I/O. The 1622 I/O will
search for a valid word clock on its S/PDIF input
port.
3 When a valid word clock lock is recognized,
the 1622 I/O will enter Digital mode and func-
tion as a standalone D/A converter using the
S/PDIF input and analog outputs 1–2.
To return the 1622 I/O to Pro Tools-based
operation:
■ Turn on your computer.
– or –
■ If your computer is on, launch Pro Tools.
If no input level settings are stored, input
levels default to +4 dBu and output levels
default to –10 dBV.
TDM_Install.book Page 37 Saturday, January 13, 2001 9:35 PM