This is an interative IPA chart, which you can edit to suit the phonetic or phonological inventory of your language. Each cell has a voiceless and voiced input window; click inside the cell to type a phone. If a cell should be greyed out, double click in the region outside of the text inputs. To add a column, first click on a phone in the column to the right of where your new column should go, then click "Add column left." Similarly to remove a column, click on a phone in that column and then click "Delete Column."