Are newer versions of the tool backward compatible with projects made with an older tool?
> New Wwise versions are compatible with older Wwise projects. If you open a project created with an old version of Wwise with a newer version of Wwise then our migration tool will automatically update your data. But this works only in one way: you cannot open a new project with an older version of Wwise.
Are newer versions of the SDK compatible with older versions of a project?
> We try to keep our sound engine interface compatible when we create new version. Some source-level incompatibilities were introduced in the past, but those breaking changes are well-documented in the SDK changes section of the documentation. As the Wwise SDK is a very high-level API, most additions we make to the sound engine do not require any supporting changes to the game code.