I am building a website that hosts acoustic recordings from marine animals (currently just fish - example here). On the website itself the files are best stored in MP3 format, as most internet browsers can play those and other formats are less supported. We also provide a download button, however, so users can copy the file for their own analyses, and do not know if it matters what format the downloaded files are in. There are storage size implications of needing to have multiple versions of each recording as the collection grows, but if the files won't actually support the community's needs then the website is not very useful.
Is there a standard in the community for a downloadable recording file? Are there limits on the software you could use or the analyses you could accurately perform if the files have been converted from WAV to MP3?