Why isnt OnTriggerEnter Tags working.

So i have the script working but i would like some polish on it as it has a slightly annoying effect. This is what i had working. Its a hover bike that has four thrusters in each corner that also set this off. So it plays my first time audio as well as my other time 4 times.

 var firstTime : AudioClip;
 var otherTime : AudioClip;
 var isfirstTime : boolean = true;
 
 
 function OnTriggerEnter(){
     if(isfirstTime == true){
         audio.PlayOneShot(firstTime);
         isfirstTime = false;
         ScoreManager.finishgame += 1;
         }
     else{
         audio.PlayOneShot(otherTime);
         }
 }

And this is my attempt to stop it doing that, it plays the first time when i tag a part of the bike with Player but then it doesnt play the other time. ROAR whyyyy

 var firstTime : AudioClip;
 var otherTime : AudioClip;
 var isfirstTime : boolean = true;
 
 
 function OnTriggerEnter(other:Collider){
     if (other.gameObject.tag == "Player"){
         if(isfirstTime == true){
             audio.PlayOneShot(firstTime);
             isfirstTime = false;
             ScoreManager.finishgame += 1;
         }
     }
     else{
         if (other.gameObject.tag == "Player"){
             audio.PlayOneShot(otherTime);
         }
     }
 }