Muting an audio source if iPod audio is playing

I know unity has no native support for this, but how can I disable a certain audio source when the player is using their ipod?

I’ve used a native plugin that I call to check the state of the iPod on a scene opening and then play or not play game music like this (it’s based on some examples I Google’d basically) -

Plugins/iOS/iOSPlugin.mm

#import <Foundation/Foundation.h>
#import <MediaPlayer/MediaPlayer.h>

extern "C" {

    bool _IsMusicPlaying () {
        BOOL isPlaying = NO;
        MPMusicPlayerController* iPodMusicPlayer = [MPMusicPlayerController iPodMusicPlayer];
        if (iPodMusicPlayer.playbackState == MPMusicPlaybackStatePlaying) {
            isPlaying = YES;
        }
    //    NSLog(@"NATIVE: Music is %@.", isPlaying ? @"on" : @"off");
        return isPlaying;
    } 
}

Plugins/iOSBridge.cs

using UnityEngine;
using System.Collections;
using System.Runtime.InteropServices;

public class iOSBridge  {
	
	// Native code definitions
	[DllImport ("__Internal")]
	private static extern bool _IsMusicPlaying ();
		
	// Accessor functions
	public static bool CheckIPodPlaying() {
		// Call plugin only when running on real device
		if (Application.platform == RuntimePlatform.IPhonePlayer) {
			
			return _IsMusicPlaying();

		} else {
			// Not running on iOS
			return false;
		}
	}
}

Then I can just call it from Javascript when needed -

var iPodPlaying : boolean = iOSBridge.CheckIPodPlaying();

Hope that helps!