Sounds not replaying

Hi, I'm creating a game when a steam sound occurs when a pipe begins to move.  The pipes start moving at different times so I have a one second delay attached to the PlaySoundAndForget.  Everything works fine except when the pipes return to their starting position and start again the first pipe plays but none of the others do.  I'm getting a return value of true for each pipe but no sound.  I have no background music and both my weighting and voice limit are way about the number of sounds playing.  A I missing something?
insert code here  public void StartPipes()
   {
       MasterAudio.PlaySoundAndForget(steamSound, 1.0f, null, soundDelay,null, null);
       Debug.Log(MasterAudio.PlaySoundAndForget(steamSound));
       StartCoroutine(MovePipes(secondsToWait));
   }