Constant values in the wave tree can be edited in place. To begin editing, select a constant node, then click on it a second time (you can also select edit from a context menu). Use the keyboard to enter the desired value. Simple expressions involving numbers, +, -, * (multiplication), / (division) and parentheses are acceptable. For example, .4 * (1 + 2/3). After entering the desired value, press the enter key or click on another node to accept the value. Alternatively, press the escape key to discard your entry and restore the previous value.