This toolbox function is available in DataSet and parameter contexts and allows a real-time synthesis using previously calculated parameters, i.e. F0 for fundamental frequency, Fof for formant frequencies from F1 to F6 and RMS for the amplitude of voicing during segments where F0 is higher than zero. During synthesis, an user interface is displayed that allows the user to modify the Gain0 synthesis parameter (for amplitude adjustment) and to stop the synthesis.