Owner`s manual

VxD console – Gina24, Layla24, and Mona

Let’s take a brief look at the various synchronization types.

Word Clock – This is a synchronization signal that connects to the BNC

connector labeled Word Clock on Layla24/Mona’s back panel. This

synchronization clock runs at the selected sample rate. Think of it as a kind of

electronic metronome, which clicks back and forth at the digital sample rate. It is

one of the most widely used forms of synchronization in digital audio.

Layla24/Mona is always generating Word Clock on its Word Clock output BNC

connector. Although it can generate Word Clock at any sample rate it is set to,

Layla24/Mona can only sync to Word Clock if the master device is set to a sample

rate between 30kHz and 100kHz. Otherwise you will get noise and/or loss of

sync.

S/PDIF – The Sony/Phillips Digital Interchange Format is a serial bit-stream that

has a clock signal embedded in the data stream. When recording from an S/PDIF

source, whether via optical cables or RCA cables, Echo products will utilize the

synchronization clock that is embedded in the S/PDIF while it decodes the

bitstream. Your Echo digital audio system can only sync to S/PDIF clock if the

master device is set to a sample rate between 30kHz and 50kHz. Otherwise you

will get noise and/or loss of sync.

Note:

When recording from a S/PDIF port, you must select S/PDIF as the

input clock. For greater flexibility, this is not done automatically. If you

find that your S/PDIF recordings contain pops or skips, be sure that you

have selected S/PDIF as your input clock.

ADAT – (Layla24/Mona/Gina24) The Alesis ADAT optical interface can send

and receive up to 8 simultaneous channels of digital audio data over fiber optic

cables. Unlike wire cables, fiber optic cables do not add noise or interference.

Layla24/Mona/Gina24 can send out (or “master”) ADAT clock as well slave to it.

If you want the interface to slave to an ADAT clock, just set the input clock to the

ADAT setting. Layla24/Mona/Gina24 can only sync to ADAT clock if the master

device is set to a sample rate between 40kHz and 50kHz. Otherwise you will get

noise and/or loss of sync.

Note:

To preserve the high audio quality of Layla24/Mona/Gina24’s

converters it is best to use the Internal input clock setting instead of

synchronizing to an external ADAT clock, which may add unwanted jitter to

the signal.

Esync – Esync is a proprietary form of super clock that is used to synchronize two

or more Echo 24-bit products like Layla24, Mona, Gina24, and Darla24. While

Gina24 and Darla24 have both input and output connectors on their PCI cards,