Thanks, Jeremy! For each trial, after listening to the stimulus, they will have to choose an answer. The reason why I used the callback function is because they can listen to the stimulus again before they choose an answer. With the linear code, it seems that the stimulus could only be played once. And I want the screen to have just the “click” button. If I don’t use the remove function, the audio bar also appears.
Is there a way for me to get around this?