Returns information about an Event that was requested to be pinned into cache via AK::SoundEngine::PinEventInStreamCache(). Retrieves the smallest buffer fill-percentage for each file referenced by the event, and whether the cache-pinned memory limit is preventing any of the files from filling up their buffer.
To set the limit for the maximum number of bytes that can be pinned to cache, see AkDeviceSettings
AK_Success if command was queued
AK_IDNotFound if the Event ID is unknown (not loaded or typo in the ID)