For the Android platform, when checking the Unity option Player Settings > Publishing Settings > Split Application Binary, APK Expansion Files are used for bundling the project assets. This effectively creates a zip file with the .obb extension that contains the StreamingAssets folder, including the SoundBanks. The default Android SoundBank loading support assumes that SoundBanks are located in either the APK file or OBB file.
If you are constructing your own OBB file externally, note that the inner path given to AkSoundEngine.SetBasePath must be the same in the OBB. OBB files must be uncompressed and unencrypted for the default I/O system to work. If this is not the case, then you will need to uncompress the OBB in the persistent data path. The CPU cost to uncompress is too high to uncompress on the fly.
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