7

Glossary 689
clock Electrical synchronization impulse, transmitted every 1/96 note. Was used in
older drum machines before the advent of MIDI (MIDI clock is an example).
comb filter effect A short delay of feedback that emphasizes specific harmonics in a
signal is generally termed a comb filter. The name is derived from the appearance of a
frequency spectrum graphic, which resembles the teeth of a comb.
compressor An effect that restricts the dynamic range of an audio signal.
controller MIDI data type. As examples; sliders, pedals, or standard parameters like
volume and panning. The type of command is encoded in the first data byte, the value
in the second data byte.
Controls view All Logic plug-ins (and Audio Units) offer a non-graphical alternative to
the Editor views of effect and instrument parameters. The Controls view is accessed via
the Controls pull-down menu at the top of each plug-in window. This view is provided
to allow access to additional parameters and to use less onscreen space.
Core Audio Standardized audio driver system for all Macintosh computers running
version 10.2 or higher. Core Audio is an integral part of Mac OS X, allowing access to all
audio interfaces that are Core Audio compatible. Logic is compatible with any audio
hardware that offers Core Audio drivers.
Core MIDI Standardized MIDI driver system for all Macintosh computers running
Mac OS X version 10.2 or higher. Core MIDI is an integral part of Mac OS X, allowing the
connection of all MIDI devices that are Core MIDI compatible.
count-in Beats heard prior to the start of a recording.
cueing Monitoring while fast-forwarding or rewinding.
cutoff frequency Frequency at which the audio signal passing through a low or
highpass filter is attenuated by 3 dB.
Cycle function A function in Logic which constantly repeats the area between the
Locator positions. To turn on Cycle mode, click the Cycle button in the Transport
window. The cycle function is useful for composing a part of a song 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.
DAE DAE is the abbreviated form of Digidesign Audio Engine. This is the driver
software for many Digidesign cards, and is primarily used for the operation of TDM
hardware and/or access to their on-board DSP chips.
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.