I don't know why I kept trying "just 1 more workaround" until I was able to find 1st 1 sound, then more.
I think I've progressed to chapter 2, but, in addition to still trying to find the details of the layout, which I assume is part of the research, VoiceOver does things I don't intend, such as double-click on an answer when I'm not even done studying the drawing, and I've been using VoiceOver on i-Devices for 3 years. I'm currently using an iPhone SE.
I don't know what other apps give me quite this guided exploration experience, so, knowing me, I'll put up with quite a bit more frustration with this app.