Use up and down buttons (top right corner ) to change numbers . The machine will go from 15 to 0 and 0 to 15 too, but going from 0 to 15 may be laggy and you 'll propably need hold the down button in order for it to work . Works fastest at 10ps/s but you need to be at 400μs/s or higher for 0-15 transition working . If the decynary displays 16 or higher reload the circut or press the up button 15 times.
