Apple Logic Express 9 - Manual (Page 1289)

Standard MIDI file (SMF) Standard file format for exchanging songs between different
sequencers or MIDI file players. Standard MIDI files are not specific to a particular sequencer
program, type of computer, or device. Any sequencer should be able to interpret at least
the type 0 MIDI file format. Standard MIDI files contain information about MIDI events,
including time positions and channel assignments, names of individual tracks, instrument
names, controller data, tempo changes, and more.
status byte First byte in a MIDI message, which determines the type of message.
Step Input function The Step Input function allows you to insert MIDI notes—one at a
time—into a MIDI region, when Logic Express is not in a real-time recording mode. This
allows you to input notes that may be too fast for you to play, or may be useful if
replicating sheet music, but you don’t sight read. Step input can be performed onscreen
with the mouse or with the computer or MIDI keyboard, or any combination of these
devices. Also see In button.
step sequencer While all sequencers, including Logic Express, step through a series of
events, this term is used to describe a device from the seminal years of analog synthesisers.
Essentially, two rows of knobs (usually 8) were individually adjusted to control the gate
time (note length) and pitch of a connected synthesizer. The sequencer would step
through these knob settings once, or repeatedly. Many modern software instruments,
particularly drum synthesizers, include an integrated step sequencer that synchronizes
with Logic Express playback. Ultrabeat incorporates a step sequencer which is considerably
more flexible than its ancient analog cousins.
stereo Short for stereophonic sound reproduction of two different audio channels.
Compare with mono.
subframe A sub-division of a SMPTE frame, corresponding to the individual bits of a
SMPTE frame. One frame consists of 80 bits.
sustain pedal A momentary footswitch that is connected to MIDI keyboards. It transmits
MIDI controller number 64, which is recorded and played back by Logic Express.
Swing parameter Alters the rigid timing of a quantization grid by delaying every other
note of a specified sub-division by a definable amount.
Sync button This button, found on the Transport bar, activates/deactivates external
synchronization mode.
synchronization Method of keeping several recording or playback devices time-locked
with one another. In virtually all synchronized setups, there will be one master device
and one or more slave devices that derive their synchronization clock from the master.
synchronizer Central unit used to control the synchronization of several devices. In most
situations, Logic Express will act as the master synchronizer.
1289 Glossary