10.6

1191Logic Pro User Guide
stereo Short for stereophonic. Refers to the sound reproduction of two different audio
channels. Compare mono.
subframe A subdivision of a SMPTE frame, corresponding to its individual bits. One frame
consists of 80bits.
summing stack A type of Track Stack that lets you combine multiple tracks and route
their output to an audio subgroup. When you create a summing stack, the outputs from the
subtracks are routed to a bus, the destination aux of which is assigned to the main track.
When the main track is selected, you can mute, solo, and adjust volume and send levels for
the summing stack, and add and edit plug-ins, affecting the sound of all the subtracks in
the summing stack. See also Track Stack.
surround Describes playback systems that make use of multiple speakers. The most
common surround format is 5.1 channels (front left, front center, front right, left surround,
right surround, and an LFE, or subwoofer, channel), typically used in home theater systems
and in cinemas. Logic Pro supports all common surround formats, and provides surround
recording, plug-in, and mixing facilities.
Surround Panner control Replaces the standard Pan/Balance knob of channel strips
for surround projects. The Surround Panner control allows you to control the relative
positioning of the channel signal between the available speakers (in the chosen project
surround format).
sustain An envelope parameter that sets the steady amplitude level produced when a key
is held down. See also envelope.
sustain pedal A momentary footswitch connected to a MIDI keyboard. The sustain pedal
transmits MIDI controller number 64, which is recorded and played back by Logic Pro, and
which can be edited as an automation parameter.
Swing parameter A parameter that alters the rigid timing of a quantization grid by
delaying every other note of a specified subdivision by a definable amount.
Sync button A button in the control bar used to turn external synchronization mode on
and off.
synchronization Refers to the method of keeping several recording or playback devices
time-locked with one another. In virtually all synchronized setups, there is one transmitter
device and one or more receiver devices that derive their synchronization clock from the
transmitter.
synchronizer The central unit used to control the synchronization of several devices. In
most situations, Logic Pro will act as the device that sends or transmits synchronization
signal to other (receiving) devices.
synthesizer A hardware or software device that can generate sounds. The word is derived
from early attempts with mechanical and electronic machines to emulate (or synthesize)
the sounds of musical instruments, voices, birdsong, and so on. Logic Pro features several
software synthesizers, including the ES1, ES2, EFM1, ESE, ESP, and ESM.
SysEx Abbreviation for System Exclusive data. SysEx data forms the top tier in the
hierarchy of MIDI commands. These messages are tagged with an identification number for
each manufacturer (the SysEx manufacturer ID number). The actual content of these MIDI
commands is left to the manufacturer. SysEx data is often used to transfer sound programs
or system settings, or to address individual sound generation or signal-processing
parameters.