Though What.CD has always embraced CD and vinyl rips, we have been more wary of cassette rips. For this reason, for as long as cassettes have been allowed on the site, they have been subject to a strict pre-approval process that occupies a great deal of both staff and uploader time. However, our users have shown themselves to be more than capable of producing quality cassette rips, and we no longer feel this process is necessary.
So, as of this announcement, users who wish to upload cassettes will no longer be subject to the pre-approval process. Like vinyl rips, they can be uploaded freely and user-reported if they fail to meet our quality standards. The rules have also changed to allow uploading of cassette releases not currently on What.CD in any other media, rather than only those releases only ever released on cassette.
The full rules are incorporated into the cassette rules, 2.10. There are more examples and specifics there, but here is an overview: