Apple Logic Pro 9 - Manual (Page 38)

AES/EBU
The AES/EBU (Audio Engineering Society/European Broadcasting Union) standard for
transferring digital audio typically uses XLR connectors in professional studio environments.
The data protocol is essentially identical to S/PDIF.
XLR connector
TOSLINK Optical and ADAT Lightpipe
TOSLINK is a connector for optical digital signals. TOSLINK is used for several digital signal
formats, although most devices support only one of these formats:
• S/PDIF (stereo digital)
• AC-3 and DTS (5.1-channel surround)
• ADAT Lightpipe (an 8-channel digital signal)
TOSLINK connector
ADAT Lightpipe is an eight-channel digital audio format developed by Alesis. This signal
format uses TOSLINK optical connectors. Eight channels are supported at sample rates
of 44.1 and 48 kHz using 24 bits per sample.
Connecting Your Audio Interface
Logic Pro supports plug-and-play for audio interfaces, making it possible to connect and
turn on a new audio interface while Logic Pro is open. An alert appears when you connect
a new device, and prompts you to select and confirm the audio interface and driver that
you want to use.
All digital audio interfaces can be susceptible to latency—a noticeable delay between
the time the audio signal is produced, and when you hear it. You should always attach
your audio interface directly to the computer, rather than through a hub, or daisy-chaining
it through another device. Doing so can cause an unacceptable amount of latency,
particularly with slower USB 1.1 devices.
MIDI Cabling
MIDI is an abbreviation for Musical Instrument Digital Interface—a universal 5-pin
connection standard and computer language—that allows communication between
MIDI devices.
MIDI Connector
38 Chapter 2 Setting Up Your System