Pro Tools 101_ An Introduction to Pro Tools 11 ( PDFDrive )

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Signal Routing Controls
The top portion of each channel strip in the Mix window provides controls
for routing signals into and out of the track. These controls include Insert
selectors, Send selectors, Input selectors, and Output selectors. Insert
selectors can be used to add real-time effects processing to a track using one
of your loaded plug-ins. Send selectors can be used to route a track’s signal
to an available bus path or output path. The Input and Output selectors are
used to route input and output signals from your audio interface for recording
or playback.
Figure 2.16 Signal routing controls