Cadillac 2011 STS Owner's Manual page 288

PTY lets the radio search for stations with specific
types of music. When this feature is turned on, the
PTYs display above the pushbuttons in place of the
programmed preset stations. Not all stations support
PTYs and the radio may not go to all of the stations
with that music type when pressing the pushbutton.
The selectable PTYs are:
CNTRY (Country)
CLASS (Classical)
EASY
JAZZ
POP
TALK
To turn PTY on or off:
1. Press to enter the main menu.
2. Turn until PROGRAM TYPE MODE displays.
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3. Press to select ON or OFF. An X appears in
the box when ON is selected.
4. Press F6 to exit the display. To return to the
original display, repeatedly press F6 or wait for
the display to time out.
the radio switch to a stronger station with the same
program type.
This feature does not function with XM radio stations.
To turn AF on or off:
1. Press to enter the main menu.
2. Turn until ALTERNATE FREQ. displays.
3. Press to select AF OFF, AF ON, or AF REG.
An X appears in the box when ON is selected.
4. Press F6 to exit the display. To return to the
original display, repeatedly press F6 or wait for
the display to time out.
Alternate frequency lets