I’d like to narrow my original question to one specific point: On iOS, does setting ApplicationMusicPlayer.state.playbackRate to a negative value support audible reverse playback of full Apple Music subscription songs? If this is not supported, could someone from Apple clarify whether any public API supports this behavior? I am not seeking access to decrypted audio or a way to bypass DRM. I’d simply like to confirm the supported behavior before investing further in this prototype. Thank you.