Cycle things with one key

Question

Hi! I want to cycle music with same key (in my case, letter "m") but I don't know how to write the function in.

Now I can crossfade music with two different keys but that is not I want. What should I do?

Help would be much appreciated :) Here is the code:

 using UnityEngine;
 using System.Collections;
 
 public class scr_MusicController : MonoBehaviour
 {
 
     void Update()
     {
         if (Input.GetKeyDown("m"))
         {
             StartCoroutine("ChangeMusic1");
         }
         if (Input.GetKeyDown("n"))
         {
             StartCoroutine("ChangeMusic2");
         }
     }
     private IEnumerator ChangeMusic1()
     {
         float fTimeCounter = 0f;
 
         while (!(Mathf.Approximately(fTimeCounter, 1f)))
         {
             fTimeCounter = Mathf.Clamp01(fTimeCounter + Time.deltaTime);
             transform.FindChild("aud_Normal").audio.volume = 1f - fTimeCounter;
             transform.FindChild("aud_Retro").audio.volume = fTimeCounter;
             yield return new WaitForSeconds(0.02f);
         }
 
         StopCoroutine("ChangeMusic1");
     }
     private IEnumerator ChangeMusic2()
     {
         float fTimeCounter = 0f;
 
         while (!(Mathf.Approximately(fTimeCounter, 1f)))
         {
             fTimeCounter = Mathf.Clamp01(fTimeCounter + Time.deltaTime);
             transform.FindChild("aud_Retro").audio.volume = 1f - fTimeCounter;
             transform.FindChild("aud_Normal").audio.volume = fTimeCounter;
             yield return new WaitForSeconds(0.02f);
         }
 
         StopCoroutine("ChangeMusic2");
     }
 }

Answer 1

 public class scr_MusicController : MonoBehaviour
 {     
    public  string[]      sourceNames = new string[] { "aud_Normal", "aud_Retro"};    
    private AudioSource[] audioSources;
    private int           currentSound;
    
    void Start()
    {
        // Set up the list of audioSources to be switched         
        if ( sourceNames != null && sourceNames.Length > 0 )
        {
           audioSources = new AudioSource[sourceNames.Length];
           for(int i=0; i<sourceNames.Length; i++)
           {
             audioSources[i] = transform.FindChild(sourceNames[i]).audio;
           }
           currentSound = 0;
           enabled = true;         
        }
        else
        {
           Debug.LogError("No AudioSource names set - disabling script");
           enabled = false;         
        }     
    }
        
    void Update()
    {
        if (Input.GetKeyDown("m") )
        {             
           StopCoroutine("ChangeMusic");
           StartCoroutine("ChangeMusic");
        }
    }          

    private IEnumerator ChangeMusic()
    {
        float fTimeCounter = 0f;
        int oldSound = currentSound;
        int nextSound = (currentSound + 1) % audioSources.Length;
 
        currentSound = nextSound;
            
        while (!(Mathf.Approximately(fTimeCounter,1f)))
        {
            fTimeCounter = Mathf.Clamp01(fTimeCounter + Time.deltaTime);
            // I fade off any sound which is not our target sound (the "nextSound")
            // since you might be cycling a sound while the last one or more crossfades
            // were not done yet
            for(int i=0; i<audioSources.Length; i++)             
            {
                if ( i != nextSound )
                   audioSources[i].volume = 1f - fTimeCounter;
                else
                   audioSources[i].volume = fTimeCounter;             
            }
    
            yield return new WaitForSeconds(0.02f);
         }
 
         // You do not need to stop a coroutine at the end of its scope - the end of the 
       // scope means the coroutine is about to stop processing. You only use 
       // StopCoroutine when you want it to stop in the middle or processing
     }

}

Cycle things with one key

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