The problem seems to have to do with how Safari requests audio and video files, and how the PCIbex Farm responds to those requests. I might be able to fix the issue, but I’d need to update the farm, which I don’t want to do too often (it comes with the risk of making the servers, and so data-collection, temporarily unavailable)
If you have access to an alternative storage space (eg. an s3 bucket, or a webserver) where you can host your audio files, I’d suggest you do that, and hopefully the problem should go away
Apologies for the inconvenience
Jeremy