B Destination; C Adat Channel - Alesis AI-1 Reference Manual

Digital interface and sample rate converter
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device is connected, and the AI-1 is receiving its clock information.
If the selected Source button's LED flashes, it means that either no
device is connected to the selected input, or the clock information is
not being provided by the source to the AI-1, or the clock
information being provided by the source is neither 48kHz or
44.1kHz (see section 1.3D)

1.3B Destination

The three DESTINATION buttons (ADAT, AES/EBU, and S/PDIF)
are used to select the digital destination. When one of these buttons
is pressed, its LED will be lit indicating it has been selected. Only
one of the destinations can be selected at a time; the corresponding
format output will be enabled, while the others will be disabled.
Here are descriptions of the three Destination possibilities:
• ADAT: This routes the AI-1 output to a connected ADAT for
recording from another ADAT, or an AES/EBU or S/PDIF
device (depending on the Source setting).
• AES/EBU: This routes the AI-1 output to a connected AES/EBU
device for recording from an ADAT, or another AES/EBU
device, or an S/PDIF device (depending on the Source setting).
• S/PDIF: This routes the AI-1 output to a connected S/PDIF
device for recording from an ADAT, or another S/PDIF device,
or an AES/EBU device (depending on the Source setting).

1.3C ADAT Channel

The four ADAT CHANNEL buttons (1/2, 3/4, 5/6, and 7/8) are
used to select two channels on which an ADAT will transmit or
receive digital audio. When one of these buttons is pressed, its LED
will be lit indicating it has been selected. Only the four defined
channel groupings (1 & 2, 3 & 4, 5 & 6, or 7 & 8) may be selected
from the front panel.
In most cases, only one of the four ADAT CHANNEL buttons will
be lit, indicating the two channels on which an ADAT will transmit
or receive audio. If both the Source and Destination are set to
ADAT, all four ADAT CHANNEL buttons will be lit indicating that
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