It seems this is not yet implemented in Firefox, but should be working on Chrome.
You have to set the playback rate after the audio has started playing. The only portable way I have found to make this work, is by waiting until you get a timeupdate event with valid currentTime.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.