Contents xiiiContentsUsing the Main menu........................................... 68Using a function key ............................................ 69Changing the keypress volume................................. 69Using the Main menu........................................... 69Using a function key ............................................ 69Turning off radio controls and keypress tones (quiet op-eration) .................................................................... 70Using the Main menu........................................... 70Using a function key ............................................ 70Hearing only channel traffic (silent operation)........... 71Using the Main menu........................................... 71Using a function key ............................................ 7111 Glossary ...................................................... 72Licence agreement ..................................... 75Index ............................................................ 77