Incorrect playback speed on Safari for 2 to 7 seconds

[fireworksordie]

https://fireworksordie.github.io/jvdsite/music

Is there something I can do to avoid this issue? on my M1 Macbook Air on Safari the playback speed starts too fast (and therefore the wrong/high pitch) but corrects itself after about 2 seconds. on my iPhone Safari it's more like 6 seconds. Chrome and Firefox (on the M1 at least) don't seem to have this problem.

I've tried a number of different file formats and codecs (including WAVs) and still experience this issue.

[cbfrance]

I can reproduce this pitch issue.

If you play NPR All Things Considered theme, the first note is wrong.

Using webamp on the Internet Archive:

https://archive.org/details/npr-all-things-considered-04-10-2005?webamp=default

Doesn't happen the second time you play it.

MacOS 12.4 M1