Ti.Media.createSound Runs sounds in background one by one but did now allow me to forward or backward song

Hi

I am using Ti.Media.sound to run different sounds in background and they are working and playing one by one.Now i want to make change of enabling the forward and backward button in native player which runs in background could i achieve something of this sort.Here is my code so far

var mp3_array = [];
 
mp3_array.push('sound1.mp3');
mp3_array.push('sound2.mp3');
mp3_array.push('sound3.mp3');
mp3_array.push('sound4.mp3');
mp3_array.push('sound5.mp3');
 
Titanium.Media.audioSessionMode = Titanium.Media.AUDIO_SESSION_MODE_AMBIENT;
var sound = Titanium.Media.createSound();   
var current_index 0;
 
function playSound(index){
 
    sound.url = mp3_array[index];
    sound.play();
 
}
 
sound.addEventListener('complete',function(){
 
    // increment the array index
    current_index++;
 
    if(current_index < mp3_array.length){
 
        // play the next mp3 in the array 
        playSound(current_index);
    } else {
          Ti.API.info('all sounds complete!');
        }
 
});
 
// play the first mp3 in the array @ index 0
playSound(current_index);

Thanks