Just Matrix Layout Panel 

The Layout Panel for an Extended Just Matrix contains two Ratio/Order textfields, one for each dimension of the matrix.  Ratio refers to the whole number ratio used as a generative interval for each dimension.  Order refers to the number of cells to generate for that dimension. The axes display both positive and negative exponents of the ratios that generate them. For example, specifying a ratio of 3/2 and an order of 2 will generate an axis of: 1/1 3/2 9/8 (all ratios are brought to within an ocatve: 2/1, so 9/4 becomes 9/8) in the positive direction and 1/1 4/3 16/9 in the negative direction, giving a total axis of : 16/9 4/3 1/1 3/2 9/8.  Specifying a ratio of 5/4 and an order of 2 will generate an axis of: 1/1 5/4 25/16 in the positive direction and 1/1 4/5 32/25 in the negative direction, giving a total axis of : 32/25 4/5 1/1 5/4 25/16.  

Keys of the matrix not on an axis are multiplicative combinations of ratios at their axial coordinates. For example the row above the X axis for the above example would be: 3/2 15/8 75/64 in the positive direction and 3/2 6/5 48/25 in the negative direction. The total row would read 48/25 6/5 3/2 15/8 75/64.  

Use the Matrix Layout Panel obtained from the New Matrix... item of the Tuning submenu to create a Extended Just Matrix.