Lower audio volume

no, for example, i would like to reduce audio "$$anonymous$$otore2" when i press A in void update.. but there's yet another audio.clip

 using UnityEngine;
 using System.Collections;
 
 public class Audio : $$anonymous$$onoBehaviour
 {
     public AudioClip $$anonymous$$otore1;
     public AudioClip $$anonymous$$otore2;
     float sound$$anonymous$$ch = 0;
     float maxSpeed = 2;
     float $$anonymous$$Speed = 0.2f;
 
     
     void Start()
     {
         if (!audio.playOnAwake) audio.Play();
     }
     
     
     // Update is called once per frame
     void Update () 
     {
         sound$$anonymous$$ch = $$anonymous$$athf.Clamp(sound$$anonymous$$ch, $$anonymous$$Speed, maxSpeed);
 
 
         if (Input.Get$$anonymous$$ey($$anonymous$$eyCode.A)) 
         {
             audio.clip = $$anonymous$$otore1;
             sound$$anonymous$$ch+= 0.09f;
             audio.pitch = (sound$$anonymous$$ch);
         }
 
 
 
         if (Input.Get$$anonymous$$ey ($$anonymous$$eyCode.D)) 
         {
             audio.clip = $$anonymous$$otore2;
             sound$$anonymous$$ch+= 0.09f;
             audio.pitch = (sound$$anonymous$$ch);
         }
 
 
         if (Input.Get$$anonymous$$ey ($$anonymous$$eyCode.S)) 
         {
             sound$$anonymous$$ch-= 0.09f;
             audio.pitch = (sound$$anonymous$$ch);
         }
 
     }
 
 
 }