cued expectations

[bimac]

We (the mesoscope wg) need your help with a task modification. For the project cortexlab_cuedexpectations (which uses the samuel_cuedBiasedChoiceWorld task), we would like to have a random subset of trials (e.g. 25%) in which the audio cue is not played at all, but everything else remains the same.
Currently the state "play tone" in the state machine code is deterministic, i.e. it triggers a 'play_tone' event on every trial. If I understand correctly, to make this probabillistic, we would need to mofidy the state machine code so that the 'play_tone' event is triggered only if the random draw is successful (or alternatively we put the volume of the sound to 0 when the draw isn't succesful). Ideally the probability of this draw would be parametrized in the task parameters.
I am not sure how to do this in practice so your help would be super appreciated!