Lynx Studio LS-ADAT - Manual (Page 13)

LS-ADAT
Page 12
To insure glitch-free recording and playback using an external ADAT device, the LS-ADAT, host
LynxTWO/L22, and external ADAT must run synchronously from a common clock source. There are
only two scenarios to consider that satisfy this requirement:
1. The LynxTWO/L22 host card is the clock master. The LS-ADAT and external ADAT device
must run in clock slave mode. This case includes host card synchronization to external clocks
such as word clocks and composite video.
2. An external ADAT device is the clock master. The LS-ADAT clock source must be derived
from either of the optical inputs or ADAT sync input and the host card clock source must be
set to LStream 2.
Due to the high-jitter observed on clocks generated by ADAT recorders, we recommend that the
Slave clock source be used if possible. This choice utilizes the LynxTWO/L22 low-jitter sample
clock for all ADAT clocking. To run in this mode, the clock source of ADAT recorder must be set to
slave to its digital input (DIG IN) and either of the LS-ADAT’s optical outputs must be connect to
the ADAT’s optical input.
Select a clock source other than Slave if your system configuration does not allow the ADAT device
to run in clock slave mode or you wish to slave the LS-ADAT to an external device.
Synchronization with the ADAT Sync In Port
The LS-ADAT incorporates an ADAT compatible 9-pin Sync In port for synchronization to external
ADAT devices. The signals received on this port include ADAT system exclusive MIDI messages for
transport control functions, time code, and word clock. Most importantly, the received time code data
provides the mechanism for enabling sample-accurate transfers of audio data to and from an external
ADAT device.
The ADAT Sync In port feeds time code control logic on the LS-ADAT that provides two methods of
sample-accurate synchronization. In systems using ASIO compatible audio applications, the LS-
ADAT utilizes Steinberg's ASIO Positioning Protocol for synchronization to ADAT time code.
Alternatively, synchronization using the LS-ADAT's Cue Point capability initiates recording or
playback with sample period resolution. The LS-ADAT also translates received time code to MTC
for general compatibility with many applications
ADAT synchronization requires the connection of a 9-pin cable from the Sync Out port of an external
ADAT device to the LS-ADAT Sync In Port.
ASIO Positioning Protocol Synchronization
ASIO specifies a sample count value for each audio data buffer to control sample position during
record or playback. When an ASIO application is running, the LS-ADAT will properly generate the
sample count for every buffer based on time code received from the SYNC IN port.
ASIO synchronization can be utilized in any ASIO compatible application that supports ASIO
Positioning Protocol. We have tested this with both Steinberg Nuendo and Cubase SX.
To enable ASIO Positioning Protocol in Nuendo and Cubase SX:
1. From the Transport menu select Sync Setup. In the Synchronization Setup dialog box, select
ASIO Positioning Protocol under Timecode Source.