Non-positive index values of panel input sources

A method to provide an audio presentation, comprising:

• assigning a first plurality of index values to a first plurality of input sources corresponding to a first panel of a graphical user interface (GUI), wherein the first plurality of input sources correspond to settings associated with a printing device;
• receiving a first action event corresponding to a first input source of the first plurality of input sources, wherein the first input source corresponds to a first setting associated with the printing device;
• generating, responsive to receiving the first action event, a second panel of the GUI, wherein the second panel corresponds to a second setting based on the first setting associated with the printing device;
• assigning the first plurality of index values to a second plurality of input sources of the second panel;
• assigning a second plurality of index values to the first plurality of input sources, wherein the second plurality of index values are lower than the first plurality of index values;
• assigning an index value comprising a zero value to a plurality of header input sources corresponding to a header of the GUI;
• providing a first audio presentation of a description of the second plurality of input sources, wherein an order for the first audio presentation is defined by a positive quantitative value of the first plurality of index values assigned to the corresponding second plurality of input sources;
• preventing a second audio presentation of a description of the first plurality of input sources when the second plurality of index values include a negative quantitative value;
• and
• providing a third audio presentation of a description of the plurality of header input sources that is assigned the index value comprising the zero value after providing the second audio presentation of a description of the second plurality of input sources that are assigned the first index value.

A non-transitory machine readable medium storing instructions executable by a processing resource to:

• assign a positive index value to a first input source of a first panel of a graphical user interface (GUI), wherein the first input source corresponds to a first setting of a printing device;
• receive a first touch signal from the GUI corresponding to the first input source to select the first setting of the printing device;
• responsive to a receipt of the first touch signal, assign a negative index value to the first input source;
• responsive to an assigning of the negative index value to the first input source, generate a second panel of the GUI, wherein the second panel of the GUI includes a second input source and wherein the second input source is assigned a positive index value and corresponds to a second setting of the printing device related to the first setting of the printing device;
• receive a second touch signal from the GUI corresponding to the second input source to select the second setting of the printing device;
• responsive to a receipt of the second touch signal, assign a negative index value to the second input source;
• responsive to an assigning of the negative index value to the second input source, generate a third panel of the GUI, wherein the third panel of the GUI includes a third input source, and wherein the third input source is assigned the positive index value and corresponds to a third setting of the printing device related to the second setting of the printing device;
• responsive to a generation of the third panel, limit a focus of a speech reader to provide an audio presentation of data describing the third input source assigned the positive index value, wherein an order of the audio presentation is defined by a quantitative value of the positive index value assigned to the third input source.