The ORANGE curve is not exactly random in fact because the app only allows rationnal numbers in parameters.
To obtain other random signals, change the two input FREQUENCES, then reset the imput PHASES to 0° (requemended).
More different are the imput frequences better the randomness will be...
i.e. 2Hz and 7Hz will give a pretty bad "random" sequence with a lenght of 14 values...
i.e. 5.73Hz and 3.29Hz would be MUCH better !