Hi,
Using the log from soundManagerPro, can you trace from where exactly the second level loading comes from?
Usually, to debug this kind of issues, I edit the custom action in question to put logs, so that I know exactly when and who fired the offensive second loading. Else, it's difficult to track since the debug flow of playmaker loose what happens prior the loading.
If you have problem editing custom actions, let me know, I can help you.
Bye,
Jean