Optimus 120-1995 - Manual (Page 8)

5. FADER-Press SEL until F and O appear on the display. Press + or - to
adjust the balance between the front and rear speakers (if you use
both).
FF and a number appear on the display when the fader is shifted to the
front. FR and a number appear when the fader is shifted to the rear.
6. MUTE- Press MUT until MUTE appears on the display. This reduces the
volume by 20 dB. To return to the original volume, press 'MUT' again.
ENVIRONMENT PRESET MEMORY
You can store treble, bass, balance, fader, and volume settings so they
can be recalled easily.
1. Repeatedly press SEL to select the control setting you with to store,
(The display shows TR, BA, B, F, and Vo in turn.)
2. Adjust the setting to the desired level, then press and hold one of
three environment preset buttons (button 1, 2, 3) for more than 2
seconds.
Note: Button 4, 5, and 6 cannot be used for this memory.
3. Press 'SEL' and select the environment preset number again within 5
seconds to recall the stored setting.
DETACHING THE CONTROL PANEL
The detachable control panel and LED help to protect your stereo from
theft. When you remove the panel, the red light flashes.
To remove the panel:
1. Press Release Up arrow. The left side of the control panel ejects.
2. Pull the panel's left side toward you. Take care not to put pressure
on the display or drop the panel.
3. Keep the panel in the supplied protective case for safekeeping.
To re-attach the panel, push it into the main body, right side first.
Note: If the control panel is not set correctly, the control buttons will