Apple Logic Pro 8 - Manual (Page 996)

996 Glossary
side chain A side chain is effectively an alternate input signal—usually routed into an
effect—that is used to control an effect parameter. As an example, you could use a side
chained track containing a drum loop to act as the control signal for a gate inserted on
a sustained pad track, creating a rhythmic gating effect of the pad sound.
Signature track Global track that shows all time and key signatures of a project.
Signature List A Logic Pro window that lists all time and key signatures of a project.
Single Trigger mode This term is associated with synthesizers such as the ES1. In this
mode, envelopes are not retriggered when tied (legato) notes are played.
SMF See Standard MIDI File.
SMPTE Abbreviation for Society of Motion Picture and Television Engineers. The
organization responsible for establishing a synchronization system that divides time
into hours, minutes, seconds, frames, and subframes (SMPTE time code). SMPTE time
code is also used for synchronizing different devices. The MIDI equivalent of SMPTE
time code is MIDI Time Code (MTC). See MTC.
SMPTE ruler In addition to the standard bar/beat display, the Logic Pro Bar ruler can
display time units in SMPTE format: hours, minutes, seconds, and frames, and can
display time code if a video is imported into the project.
Snap menu A pop-up menu found in the local menu of linear editing windows. It
determines the behavior of regions or events when edited; lengths and cuts will snap
to the nearest possible position (as determined by the chosen Snap menu value), for
example.
software instrument Software counterpart to hardware samplers or synthesizer
modules, or acoustic sound sources such as drumkits or guitars. The sounds generated
by software instruments are calculated by the computer CPU, and played via the audio
interface outputs. Often colloquially called softsynths or softsamplers.
solo A way to temporarily highlight one or more tracks or regions or events, allowing
them to be heard in isolation.
Solo tool Click-holding on individual regions or events with the Solo tool temporarily
allows them to be heard in isolation. All other objects are muted.
SPP Abbreviation for Song Position Pointer, a MIDI clock timing pulse sub-message
that indicates the current “song” (project) position. It is accurate to bars (and beats for
some devices), but is not as accurate as MIDI Time Code (MTC). If you have a choice of
these two when synchronizing Logic Pro, choose MTC (see both the MIDI clock and
MTC entries).