Apple Logic Express 9 - Manual (Page 1133)

Input channel strips can be used as live inputs that can stream audio signals from external
sources (such as MIDI synthesizers and sound modules) into a stereo mix (by bouncing
an output channel strip).
Note: An alternative to using input channel strips in this way is the use of the I/O plug-in;
you can also click the Input Monitoring button on an audio channel strip and choose the
input(s) you want to monitor or record via the Input slot.
Bus Channel Strip
You can only create bus channel strip objects in the Environment. In general, you will not
need to do so, as all audio bussing (send/return routing via the Send slots of channel
strips) is handled by aux channel strips.
Bus channel strips are primarily included for compatibility with earlier versions of
Logic Express, and for use with certain audio hardware devices.
Note: File > Project Settings > Audio > Automatic Management of Channel Strip Objects
must be unselected if you want to create input channel strips. (It is on, by default.)
Prelisten Channel Strip
The Environment’s Prelisten audio channel strip is used for monitoring in the Sample
Editor, Audio Bin, Loop Browser, and Browser. It is created automatically in each
project—you can find it to the right of the highest-numbered audio channel strip.
1133 Chapter 37 Environment Objects Reference