AOR AR2700 Operating Manual page 17

The key is also used to select menu options under certain circumstances.
The key may be used to place the receiver in manual search mode by pressing
and holding the [DOWN] key for more than 1.5 seconds while in manual mode.
The sequence [2ndF] [DOWN] places the receiver into "SS" descramble mode,
refer to the information supplied with the optional printed circuit board, not
available within the UK.
The sequence [2ndF] [DOWN] with the DOWN key being held for more
than 1.5 seconds places the receiver into "SS" descramble select mode, refer
to the information supplied with the optional printed circuit board, not available
within the UK.
[1] [ATT] Numeric 1 / ATTENUATOR key
This key acts as a numeric 1 when entering frequencies via the keypad.
In search, scan and memory modes this key is used to identify bank 1.
If the sequence [2ndF] [1] is keyed, the attenuator is toggled On/Off. The
ATTENUATOR is a useful feature to aid with the reduction of interference
caused by the presence of strong signals.
[2] [STEP] Numeric 2 / STEP key
This key acts as a numeric 2 when entering frequencies via the keypad.
In search, scan and memory modes this key is used to identify bank 2.
If the sequence [2ndF] [2] is keyed, the tuning STEP size may be selected.
[3] [MODE] Numeric 3 / MODE key
This key acts as a numeric 3 when entering frequencies via the keypad.
In search, scan and memory modes this key is used to identify bank 3.
If the sequence [2ndF] [3] is keyed, the receive MODE may be selected.
[4] [REC/PLAY] Numeric 4 / Record / Play (optional) key
This key acts as a numeric 4 when entering frequencies via the
keypad.
In search, scan and memory modes this key is used to identify bank 4.