Using AVAudioSessionCategoryMultiRoute to play from both parts of the ear and the bottom speaker

Question

I'm trying to figure out how to get audio to play both the front speaker and the lower speaker in tandem using AVAudioSession and AVAudioSessionCategoryMultiRoute on iOS.

I really don't mind if the solution is a hack, I know that this should be possible (even using a private API), so any method that brings me closer to pseudo-stereo audio will be a big help.

Just point this out for educational purposes, so you don’t have to worry about it being rejected.

NSError *error = nil; [session setCategory:AVAudioSessionCategoryMultiRoute error:&error]; AVAudioSession *session = [AVAudioSession sharedInstance]; [session setCategory:AVAudioSessionCategoryPlayAndRecord error:&error]; [session overrideOutputAudioPort:AVAudioSessionPortOverrideSpeaker error:&error]; 

That's where I am with my investigation, additional suggestions may include several AVAudioSessions that are synchronized or something even more exotic.