You can play the clips by pressing the play buttons next to them, which works as expected. If you stop a clip it resets so next time you click its play button it again starts from the beginning.

You can also click within the progress bar of a playing clip and it will jump to that spot, which is handy for repeating a section somewhere in the middle.

You can also click in the progress area of a clip when no clip is playing and it will start playing at the appropriate offset, but not necessarily the clip whose progress bar you clicked. It actually plays the last clip whose play button you pressed. It does not start the progress bar for that clip (or the clip you clicked in) so you won't see that it is not playing the clip you expected. You'll only notice it if the last play button you clicked was for a different song.

This completely messed up the quiz for me. I'd press the play button on each clip of a set and listen all the way through. Say I thought I heard some percussion 3/4 of the way through that seemed off on one of them. I'd then play just that part by clicking in the progress area of the three clip about 3/4 of the way in, thinking that is letting me hear that section of each clip. Instead it is just giving me that section of the third clip each time.