AST files contain PCM16 sound data. They're used in Super Mario Galaxy for musics, and possibly in other games.
They contain an header followed by a BLCK chunk.All the data in those files are big-endian, except where mentioned.All the offsets are absolute (from begining of file), except where mentioned.All the sizes are in bytes, except where mentioned.
=== AST header ===
=== BLCK chunk ===
The BLCK chunk directly follows the AST header. It contains a 32-byte header, followed by the PCM16 sound data.
Here's a description of it: