Apple Logic Pro 8 - Manual (Page 997)

Glossary 997
S/P-DIF Short for Sony/Philips Digital Interface, a standard transmission format for
professional stereo digital audio signals. The format is similar to AES/EBU, but uses 75
ohm coaxial or optical connectors and cabling. Depending on the type of devices
involved, AES/EBU and S/P-DIF coaxial interfaces can communicate directly. Most digital
audio interfaces available today will feature S/P-DIF connectors.
split channel audio files Each channel of multi-channel audio files (stereo or surround)
are usually dealt with together. These files are said to be interleaved. Edits to one
channel will affect the others equally. Logic Pro allows you to separate these files,
making them split channel audio files, enabling independent edits to each. Also see
interleaved audio file.
staff style A staff style determines the appearance of notation on a musical staff. You
can define note sizing and spacing, number of staff lines, fonts, and more for each staff
style.
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 Pro 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 Pro, 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 Pro 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.