Yamaha SW1000XG Advanced Manualbook page 52

Synchronisation is achieved using what's called a wordclock, which is a clock signal for synchronising all the digital
audio words in an audio system. Note that wordclocks are not the same as SMPTE or MIDI time code, which are
used to synchronise audio recorders, MIDI sequencers, and so on. Wordclock synchronisation refers to the
synchronisation of the digital audio processing circuits inside each digital audio device.
In a typical digital audio system, one device acts as the wordclock master and the other devices act as wordclock
slaves, synchronising to the wordclock master. If the DS2416 is the only digital audio device in your system, no
special wordclock settings are required, as the DS2416 synchronises to its own internal wordclock. The SW1000XG
card not having a digital input port will always act as a wordclock master running from its internal clock source.
If you add the SW1000XG to the DS2416, the DS2416 will have several options as to where its wordclock
information is coming from. Our interest lies in the SI option, for as we said, the SI connector can also carry
wordclock info.
Wordclocks run at the same frequency as the sampling rate. The SW1000XG generates its own wordclock at 44.1
kHz (the industry-standard sampling rate for music CDs). As we have seen the DS2416 can be used as a wordclock
slave synchronised to an external wordclock of the SW1000XG (or indeed to other devices such as DAT recorders)
between 30.08 kHz and 50.88 kHz (32 kHz –6%, 48 kHz +6%).
Converting the sampling rate of digital audio is a complicated process, so it's best to use the 44.1 kHz sampling rate,
especially if your work is destined for CD distribution.
Before commencing with a recording session, make sure that all wordclock slaves are synchronised to the master.
Some devices have front panel indicators to show when they are wordclock synchronised and this is the case with
the software support for the DS2416/SW1000XG linkup.
Once connected together, the SW1000XG will be passing its wordclock information to the DS2416 at 44.1 kHz. For
the actual audio to be passed over however to the SUB input channels of the DS2416, you need to make sure that
the DS2416 is actually listening.
If, as we discussed, we take Cubase VST as our example, when you have the DS2416 correctly installed in VST24
(any version after version 3.6) you will see an additional option menu in the VST audio section labelled DSP Factory.
Opening this will present you with several new options, one, which is labelled OUTPUT PATCHBAY. It is here you
will see the options for wordclock selection for the DS2416. Now if you have correctly connected the 2 cards together
using the supplied link cable, you will be able to select EXT SI as your option. If the led for this stays lit when you
select it, you have successfully got the SW1000XG and the DS2416 talking to each other, and the DS2416 is now
reliant on the master clock from the SW1000XG. If the LED doesn't light up, then you may need to open up your
computer and check the connection cable, make sure it is securely slotted in.
Now you return to the DSP Factory menu in VST and open up the INPUT CONSOLE window. This window allows
you to configure the DS2416 mixers input sources. Channels 9-16 and 17-24 are your 8 options for sub inputs 1-8
which correspond to the 8 discreet channels we mentioned earlier that may be passed between the 2 cards. As a
point of note, as many tracks as your hard disk is capable of can actually be passed between the 2 cards, just across
8 discreet channels.
In the VST DSP Factory Input console window then, you will be presented with the options as shown in the following
diagram
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