I am new to PsychoPy and I will appreciate any help with my issue. My PsychoPy version is 1.85.2 on Macbook Air with OS 10.13.1
I am trying to make a sound presented at a random moment during a set of trials (and only once during this set). The set of trials is a sequence of 6 different positions of the stimuli and correct responses, which should be repeated every time but the sound should be playing in a random position of a stimuli.
It looks like this: I have a Routine with stimuli, which has a loop around it to define (with xlsx file) this set of trials.
I do not understand how to make a sound be random and in the same time control that it will be just once in the set of trials.