Sangean ATS-405 Manual page 29

Fine Tune
When radio is on, waveband is selected. Press FINE
TUNE button to allow  kHz tuning step for MW/SW
wavebands and 0 kHz for FM band, display will appear
FINE TUNE. Press FINE TUNE button again to cancel
fine tune setting, display FINE TUNE will disappear and
radio will be back to normal tuning step.
Tone control (News/Normal/Music)
You may adjust tone performance according to radio
program you are listening. Switch News/Normal/Music
knob to NEWS for listening to news program or AM
band to reduce hiss noise from the background.Switch
to MUSIC for listening to music program. For normal
listening, set the switch to Normal mode.
FM Stereo/Mono switch
To listen to FM stereo broadcasts, tune to the required
station, plug in headphones and set the FM ST. MO
switch located on the left hand side of the radio to the
ST. (stereo) position. If the station being received is weak
and some hiss may be audible, to reduce the hiss, set
the switch to the MO. (mono) position to mono reception.
Note:
FM stereo is only available via earphones.
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