I have this file here, that is supposed to be a wave audio file, but seems to have some obfuscation applied to it. The file header is here: https://pastebin.com/LD5aA1EG Any suggestions where else it would be appropriate to ask?
The file header once decoded shows that your wav file is over 320Mb. (the 4 bytes after "data")
The key changes every 512 bytes, so if they are set in advance you would need 625520 stored keys. This is of course very unlikely.
I think only the first key is frozen, the others can be just the XOR of the first 2 bytes of each group of 512 bytes.
To verify it would require a greater number of data, at least 1Mb, or better the complete zipped file.