Specifications

Glossary 619
indexing Used by databases to obtain and main-
tain the data displayed in browsers. Indexing
creates and updates a database with the latest
metadata information.
item In digiBase, each row of data is referred to
as an item in the Items List. Items include Vol-
umes, Catalogs, Session files, and Media files, as
well as other types of files.
latency Time delays inherent in internal pro-
cessing or generation of audio signals within a
computer.
Legacy I/Os Older Digidesign audio interfaces
(such as 888|24 I/O and 882|20 I/O) that can be
connected to Pro Tools|HD audio interfaces
(such as 192 I/O and 96 I/O) for additional input
and output channels. Legacy interfaces can only
be used with 44.1 kHz and 48 kHz sessions.
lightpipe See ADAT Lightpipe.
Loop Sync A dedicated clock signal for synchro-
nizing multiple HD-series interfaces together.
Loop Sync uses a Word Clock signal based on
sampling rates of either 44.1 kHz or 48 kHz. As
sample rates increase in the system, Loop Sync
continues to operate at a base rate of 44.1 kHz or
48 kHz, depending upon the higher rate. Loop
Sync should be used only to chain multiple HD-
series peripherals together.
machine control Pro Tools functions to control
or be controlled by an external transport, typi-
cally a VTR or ATR.
Marker Memory Location referenced on a time-
line, typically used to store locations to impor-
tant points in a session. See also Memory Loca-
tion.
master (device) “Lead” machine or Pro Tools
System in a synchronized machine arrange-
ment. Slaves follow masters. There can only be
one master at any given time.
Master Fader track Governs the overall output
of one or more tracks.
media file A file that contains actual audio,
video, or graphics data. It also contains a variety
of metadata (such as file name and format).
Memory Location Pro Tools supports up to 200
Memory Locations, which can include markers,
Edit selections, record and play ranges, track set-
tings, and other data. They can be viewed and
sorted in the Memory Locations window, from
which they can also be accessed.
metadata Media files, session files, and other
types of files contain their own sets of metadata,
which include general types of data such as file
name, creation date, and file size. Metadata var-
ies with file type, format, and kind.
MIDI (Musical Instrument Digital Interface) A
communication protocol designed to allow
equipped instruments such as synthesizers to in-
tercommunicate for control and playback pur-
poses. Information transmitted over MIDI in-
cludes note-ons, note-offs, key velocity, pitch
bend, and other performance data. Connections
are made using cables equipped with 5-pin DIN
connectors.
MIDI Event List Pro Tools window that shows
the contents of a MIDI track in a column, for
easy editing of individual MIDI events.
MIDI I/O Digidesign’s USB-based MIDI inter-
face. Features 10 MIDI inputs and outputs for a
total of 160 MIDI channels and supports time-
stamping for superior timing accuracy and pre-
cision.
MIDI Machine Control (MMC) See machine con-
trol.
MIDI Time Code See MTC.