Make a function last multiple frames

Hi there.

I'm currently working on my Sparky Konga application (Example Video) and I'm trying to fix an issue I'm having with the microphone going off accidentally when I hit the bongos. Since then, I'm currently, I'm telling the microphone to go to a value of 0 everytime it gets an OSC Message from the microphone that it hears something. However' I realize that because it's all within the update function, it will only activate for a single frame that the button is pressed. To avoid it hearing me hit the bongos and the vibration as often, I want to see if I can get the function telling the mic to go to zero last multiple frames to minimize the chances of it messing up. However, I'm not sure at all how exactly to make something like that last multiple frames.

Here's my source code. What would I need to change to accomplish this?

 using UnityEngine;
 using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Text;
 using UnityOSC;
 
 public class BoncoClapScript : MonoBehaviour {
     
     public int burst = 500;
     public AudioClip clap;
     public AudioClip clap2;
     public bool alt;
     public int filter = 14;
     private Dictionary<string, ServerLog> servers;
     
     /*public Light flash;
     private float lerpTime = 0.5f;
     private float i = 0;*/
     
     // Use this for initialization
     void Start () {
         OSCHandler.Instance.Init();
         servers = new Dictionary<string, ServerLog>(); 
         particleSystem.emissionRate = 0;
     }
     
     /*public void OSCMessageReceived(OSC.NET.OSCMessage message){
     string address = message.Address;
     ArrayList args = message.Values;
     }*/
     
     // Update is called once per frame
     void Update () {
         
         if (Input.GetKey(KeyCode.JoystickButton9) || Input.GetKey(KeyCode.S))    {
             alt = !alt;            
         }
         
         if (Input.GetKey(KeyCode.JoystickButton9) || Input.GetKey(KeyCode.S) && alt == true)    {
             //alt = alt;
         }
         
         OSCHandler.Instance.UpdateLogs();
         servers = OSCHandler.Instance.Servers;
         
         foreach( KeyValuePair<string, ServerLog> item in servers )
         {
             // If we have received at least one packet,
             // show the last received from the log in the Debug console
             if(item.Value.log.Count > 0) 
             {
                 int lastPacketIndex = item.Value.packets.Count - 1;
             
                 Debug.Log(String.Format("SERVER: {0} ADDRESS: {1} VALUE 0: {2}", 
                                                     item.Key, // Server name
                                                     item.Value.packets[lastPacketIndex].Address, // OSC address
                                                     item.Value.packets[lastPacketIndex].Data[0].ToString())); //First data value
         
                 int mic = (int) item.Value.packets[lastPacketIndex].Data[0];
                 Debug.Log("microphone" + mic);
             
                 //Triggers Particles, sounds, and sets buffer for mic values
                 if (mic >= filter || (Input.GetKeyDown(KeyCode.W))  && alt == false) {
                     particleSystem.Emit(burst);
                     audio.PlayOneShot(clap);
                     //flash.range = (5 - Time.deltaTime);
                 
                 if (mic >= filter && alt == true) {
                     particleSystem.Emit(burst);
                     audio.PlayOneShot(clap2);
                     //flash.range = (5 - Time.deltaTime);
                     }
                     
                 if (Input.GetKeyDown(KeyCode.JoystickButton0) || Input.GetKeyDown(KeyCode.JoystickButton1) || Input.GetKeyDown(KeyCode.JoystickButton2) || Input.GetKeyDown(KeyCode.JoystickButton3)) {
                         mic = 0;
                     }
                 
             }
             
         }
         
         }
         
         if ((Input.GetKeyDown(KeyCode.W))) {
                     particleSystem.Emit(burst);
                     audio.PlayOneShot(clap);
                     }
                 
                 if (Input.GetKeyDown(KeyCode.W) && alt == true) {
                     particleSystem.Emit(burst);
                     audio.PlayOneShot(clap2);
                     }
     
     }
 }