Behavior or Accident?

Therapy seemed to be going well today. Firstborn was very chatty while wearing the headphones in the car. He was on song 9 (the last of the day's program) when I told him to make sure he tells me when it goes silent. He replied that it already was. We were only 1 minute into the track, so that seemed a bit weird. Thinking that maybe they made it really quiet to see if he could discern the music, I had him keep listening for 2 more minutes. He kept insisting that there was no music so after 3 minutes, I shut it off.

When we got to our driveway, I asked him to give me the headphones and he did. They had no cord in them. No wonder he didn't hear anything. Now I know he didn't tell me when he stopped hearing the music. I keep asking him to tell me when he doesn't hear the music. So I got mad at him and sent him to his room. I have no idea how much of the program he heard today. I made him listen to the program again when we got home. (That's when he told me it made him too sick to do his homework yesterday.) Again, he didn't complete the program because he said the machine was making a weird noise. I was on the phone with Therapist Lady and was unable to help him.

So the question: Is he doing this to avoid listening or was this an accident? We really need to talk today to make sure he is clear as to why he is doing this program.

Later in the day, Firstborn also broke down crying when I told him to come in from play.