Data processing

A data processing apparatus comprising:

• a touch-sensitive display screen for displaying a set of screen icons associated respectively with an array of user-operable controls, said array of user-operable controls being adjustable by movement of a user's hand on the touch-sensitive display screen while touching one of said controls,
• wherein a particular position of a user's hand on one of said controls adjusts a gain value relative to current levels and irrespective of the start position of the user's hand on the touch-sensitive display screen;
• a detector for detecting when the user's hand is touching one of said controls;
• and
• a display processor, responsive to a detection, such that when said user's hand touches one of said controls, said screen icon associated with said control is enlarged and highlighted on said touch-sensitive display screen, thereby facilitating the user's operation of said array of controls,
• wherein when a pop-up icon, representing a control that was touched, is shifted diagonally downwards and to the right, by between 1 and 10 pixels, on the display screen, thereby indicating that the control is under adjustment, and
• wherein particular areas are colored in different shades according to degrees of proximity of the user's hand to these particular areas.