In the Question itself, there is an option to include grade information, as well as general feedback to students. General feedback only appears once student has submitted the item. For example, we include a copy of our grading rubric for students to see. You could include insert the model recording here so that students can listen to it after having submitted their quiz. This feature, of course, has nothing to do with Poodll, just a normal possibility for providing feedback in Moodle.