ART Pro Audio DPS - DI/O Preamp System - Manual (Page 9)

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Typically, the higher the sample rate, the more accurate the digital
conversion is - but frequently, one is limited by the digital recording
system being used. Make sure that, when selecting your sampling rate,
the digital recording system you are working with is operating at the
same rate.
ADAT CHANNEL CONTROL
This button controls the current ADAT channel the DPS™ is
transmitting over. The DPS™ only transmits over ADAT when the
sample rate is set to 48kHz (ADAT master clock mode), ADAT (ADAT
Slave Clock mode), or EXT (Word Clock Sync mode). By toggling
through, one can select to transmit over channels 1-2, 3-4, 5-6, 7-8, or
all 8 of them at once. When no lights are on, this means all incoming
ADAT channels are bypassed. This is frequently used when the DPS™
is in an ADAT chain, but not currently being used.