issue under investigation.
its clear autoplay doesnt provide api for this functionality, but, as lower level APIs are involved (winmm.dll) i think it can be tweakeable using Dll.CallFunction and winmm.dll members like PlaySoundA or mciSendCommandA with the correct parameters.
to determine it, i will hook some members of winmm in a test project to know how multimedia are created and loaded.
i will feedback my conclusions here