Digital Clock Considerations - Alesis ADAT-XT20 Reference Manual

Chapter 5: Multiple ADAT-XT20 Operation
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IGITAL
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LOCK ONSIDERATIONS
When switching between the XT20's two internal clock sample rates (48
kHz and 44.1 kHz), the reference base used for computing tape location
is changed. The result is that the same tape location will appear to
have two different time addresses depending on the sample rate
(CLOCK) you are using. Since the XT20 cannot detect the sample rate of
an external clock, it is therefore necessary that you select between DIG
48K and DIG 44.1K to choose which reference base the XT20 should
use to calculate tape positions by while syncing to the digital clock.
This is done by pressing the [CLOCK SELECT] button. See page 59 for
more information.
ADAT XT20 Reference Manual