Second audio stimulus won't loop in builder mode

Hey! I wanted to have an audio stimulus play once and have the key response recorded from the end of the audio stimulus. After the audio stimulus plays once, I want the copy of the audio stimulus to keep playing/looping until there is a response.

My prac_audio_resp succesfully begins after completion of sound_3. After sound_3 plays once, I have sound_3r play. The problem is the audio copy sound_3r only plays once. I have tried to put in code for begin routine where it says sound_3r.loops = -1 . I also put loops = -1 in the duration portion of sound_3r but neither works. Help please!