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1016 Glossary
offset The playback point in a source audio file can differ from the start point (anchor)
of the file. This is known as an offset or start point offset. Offset is also used in
conjunction with video time code, where the start time of the Logic Express project
and QuickTime movie file can be offset (different) from each other. A further use of the
term is when the amplitude of a waveform is off-axis from the center line (due to a
recording error caused by hardware). This can be rectified with the DC Offset function
in the Sample Editor. See DC Offset.
OpenTL Abbreviation for Open Track List. This file format, typically used for data
exchange with Tascam hard disk recorders, such as the MX 2424, can be imported and
exported by Logic Express. The OpenTL file format only supports the exchange of audio
data (audio regions, inclusive of track position information). MIDI and automation data
are ignored when using the Logic Express OpenTL export function.
option Alternative function, often in the form of a checkbox, sometimes also available
as a menu entry.
Option Modifier key, also known as the Alt key in MS Windows.
output channel strip Channel strip type in the Mixer that controls the output level and
pan/balance for each physical output of your audio interface.
Page view A display mode in the Score Editor, used to view and lay out notation as it
will appear on the printed page.
pan, pan position The placement of mono audio signals in the stereo field, by setting
different levels on both sides (see Balance).
Pan control Rotary knob (directly above the Level fader) on mono channel strips, that
determines the position of the signal in the stereo image.
Parameter box Field on the left side of Logic Express windows (or in the Inspector). It
is used to adjust the parameters of the selected track, regions, events, or objects. Also
see Inspector.
peak meter A digital audio meter that displays the absolute volume of an audio signal
as it plays. So named because every peak in the signal can be accurately seen.
peak 1) The highest level in an audio signal. 2) Portions of a digital audio signal that
exceed 0 dB, resulting in clipping. You can use the Logic Express level meter facilities to
locate peaks and remove or avoid clipping. The Search Peak command in the Sample
Editor Functions menu searches for the sample bit with the greatest amplitude value.
Pencil tool Tool used to create empty MIDI regions in the Arrange. It can also be used
to add audio regions to the Arrange, when used in conjunction with the Shift key. In
the Sample Editor, the Pencil can be used to draw out transient signal spikes (pops and
clicks) in signals.