Apple Logic Express 9 - Manual (Page 1269)

Cycle function A function in Logic Express that constantly repeats the area between the
locator positions. To turn on Cycle mode, click the Cycle button in the Transport bar. The
Cycle function is useful for composing a part of a project or editing events, as examples.
The cycle area is shown as a green stripe in the top part of the Bar ruler.
DA converter or DAC Short for digital/analog converter; a device that changes an analog
signal into a digital signal.
data bytes These define the content of a MIDI message. The first data byte represents
the note, or controller number; and the second the velocity, or controller value.
DAW Acronym for Digital Audio Workstation. A computer used for recording, mixing, and
producing audio files.
dB Abbreviation for decibels, a unit of measurement that describes the relationships of
voltage levels, intensity, or power, particularly in audio systems.
DC offset An error that can result in direct current (DC) being layered over the audio
signal, resulting in a vertical shift in the waveform position shown in the Sample Editor.
decay An envelope parameter that determines the time it takes for a signal to fall from
the maximum attack level to the sustain level. See envelope.
deesser A signal processor that removes hissing or sibilance in audio signals.
default The preset parameter value.
delay In the Environment, an object that can create a series of repeats. In the Arrange
window, a region parameter that can delay or advance a selected region by a given
number of milliseconds. Delay is also an effect process that delays the incoming audio
signal, resulting in subtle chorusing effects through to endless repeats of the signal.
destructive Destructive audio processing means that the actual data of an audio file is
changed, as opposed to just editing peripheral or playback parameters.
Devices pane In Logic Express, the Logic Express > Preferences > Audio > Devices pane
is used to select and configure your audio hardware devices. In essence, you are altering
the driver configuration of your devices when using the Devices pane parameters. Also
see driver.
DFS An abbreviation for Digital Full Scale. Sometimes expressed as 0 dB DFS. This (zero
dB—as shown on the Logic Express channel strip level meters) is the maximum theoretical
level that a digital signal can reach before clipping and other types of distortion may be
introduced.
dialog A window containing a query or message. You must interact with it (by clicking
a button) before you can continue.
1269 Glossary