10.6

Table Of Contents
1167Logic Pro User Guide
Glossary
AAC Abbreviation for Advanced Audio Codec. A compression and decompression
algorithm and file format for audio data.
AAF Abbreviation for Advanced Authoring Format. A cross-platform, project exchange file
format you can use to import multiple audio tracks, inclusive of references to tracks, time
positions, and volume automation.
accelerando A gradual increase in tempo. See tempo.
AD converter (ADC) Short for analog-to-digital converter. A device that converts an
analog signal to a digital signal.
ADAT Abbreviation for Alesis Digital Audio Tape. The ADAT is an eight-track digital
multitrack cassette recorder that uses an S-VHS video tape to record audio at 16- or 20-bit
depth.
ADAT optical An optical interface for parallel transmission of eight audio channels via fiber
optic cable. ADAT optical is a well-established standard for digital multichannel interfaces.
AES/EBU Abbreviation for Audio Engineering Society/European Broadcasting Union. This
association has a standard transmission format for professional stereo digital audio signals
also called AES/EBU. The format is similar to S/P-DIF, but uses balanced line drivers at a
higher voltage. Depending on the type of devices involved, AES/EBU and S/P-DIF coaxial
interfaces can communicate directly. See also S/P-DIF.
aftertouch A MIDI data type generated by pressure on keys after they have been struck.
There are two types — channel aftertouch, the value of which is measured by a full length
keyboard sensor and that affects all played notes, and polyphonic aftertouch, which
is individually measured and transmitted for each key. Aftertouch is also known as key
pressure or pressure sensitivity.
AIFF Abbreviation for Audio Interchange File Format. A cross-platform file format
supported by a large number of digital audio and video editing apps. AIFF audio can use a
variety of bit depths, most commonly 16- and 24-bit.
ALAC Abbreviation for Apple Lossless Audio Codec. An encoding/decoding algorithm that
delivers lossless audio compression.
alias A pointer to a MIDI region in the Tracks area. An alias doesn’t contain any MIDI data,
but points to the data of the original MIDI region. You can create an alias by Option-Shift-
dragging a MIDI region to a new location. An alias can’t be edited directly; however, any
change to the original region also affects the alias.
All Files Browser One of the browsers in the Browsers area used for file management and
data import tasks. See also Browsers.