Yes, a good point. I confirm, also in my experience problems are very dependent on particular sound files. Some work perfectly fine, some make troubles.
And it's not just encoding, it seems to be dependent also on what's inside the sound file like a particular waveform or length.
For me the worst were a sequences of very short sounds (fractions of second) played in a direct response to rapid successive keypresses (keydown-keydown-keydown should make pew-pew-pew). No matter what I did, there was always at least one browser with some showstopping bug.
And it's not just encoding, it seems to be dependent also on what's inside the sound file like a particular waveform or length.
For me the worst were a sequences of very short sounds (fractions of second) played in a direct response to rapid successive keypresses (keydown-keydown-keydown should make pew-pew-pew). No matter what I did, there was always at least one browser with some showstopping bug.