Audio Clip Random Start time, end random amount of timelater

Here's what I'm trying to do. I have 6 audio clips. I want to randomly load one and start it at a random time. I want it to stop a random amount of time later. This stop time would preferably be a float as I only want each clip to play between .4-.8 seconds.

Currently, I'm just trying to add 1 second to the stop time because I think that audio.timeSamples is an int and I don't really understand how to add a float amount. There's probably a better way to do it, but after a lot of Googling, I can't quite get it.

So far, it's not throwing any errors, but it's not doing what I want it to do. I just loads a random clip every frame. I think I'm supposed to be using the sample rate here somewhere, but I'm not understanding how to use it correctly. All of the clips are at 11025.

Thanks!

using UnityEngine; using System.Collections;

public class VoiceScanner : MonoBehaviour {

 public AudioClip[] myClip;
 int RandomStartTime = Random.Range(1,50);

 public AudioSource soundFile;
     // Use this for initialization

 void Start () {
         audio.clip = myClip[Random.Range(0,myClip.Length)];
         audio.Play();
         
     }
     
     void Update () {

     int startTimesample = RandomStartTime ;
     int endTimesample = RandomStartTime +(1);

     if (audio.timeSamples < startTimesample) {
         audio.timeSamples = startTimesample;
     } else if(audio.timeSamples > endTimesample){
         audio.Stop();
     }
 }
 

}