Each key on the remote controller and on the front panel has it's primary function, which is activated right after pressing this key. But there are some keys which have secondary functions, activated after some delay when you are pressing these keys longer. So, when you will press & hold some key which has primary and secondary function, first will be activated primary function and after some delay (delay time is variable and depends on the key which you have pressed) will be activated secondary function.

Here is a list of keys with secondary functions:
* 1 - Volume+
* 4 - volume-
* 5 - switch the picture format (Letter box, Pan&Scan, 16:9)
* 7 - mute on/off
* 0 - VFD dimmer
* ENTER - set region 0 (region free) - you will be able to play any DVD-Video movie
* CLEAR - set default region - it will bring back the default region which was set before
          making the player region free
* SURROUND - "SURROUD" is now the secondary function, primary function of this key is "Shuffle"
             - used for mp3/wma playback
* > (right arrow) - faster music/movie playback, increases the pitch
* < (left arrow) - slower music/movie playback, decreases the pitch