In one aspect, a method for adjusting one or more parameters using an interface will be described. A contact point on a display is detected. A parameter is adjusted based on a distance between a reference point and the contact point. A second parameter is adjusted based on an angle between a base line and a contact line. The base line is a reference line that extends from the reference point. The contact line is a reference line that connects the contact point with the reference point. Various systems, devices and software are described that help implement the above method.