Switch to turn sound on/off for entire APP

Greetings. I am having trouble figuring out how to turn off/on all sound for the app via a switch. Right now I have around 30 items in a tableview. The last item in the tableview is the switch for sound control. All 30 tableview items click to a new window with sounds on them. How do I make the switch in the tableview turn on/off the sounds for all those windows. Would like the user to have a silent app experience if they so choose.

Tableview code:

var soundSwitch = Titanium.UI.createSwitch({
    value:true,
    top:8,
    left:130
});
 
var soundControl = Ti.UI.createTableViewRow({
    height:44,
    backgroundColor:'fff',
    backgroundImage:'img/rowup.png'
});
 
soundControl.add(soundSwitch);
 
soundSwitch.addEventListener('change', function()
{     
        if (soundSwitch.value == false)
        {
            Ti.App.fireEvent('volume_down');
        }
        else if (soundSwitch.value == true)
        {
           Titanium.App.fireEvent('volume_up');
        }
});
 
tableview.addEventListener('click', function(e)
{
    if (e.rowData.detail) {
        var newwin = Titanium.UI.createWindow({url:e.rowData.detail});
    }
    newwin.open({fullscreen:true});
});

> Tableview item clicked - new window opens. Code:

var file = Titanium.Filesystem.getFile(Titanium.Filesystem.resourcesDirectory,'whoosh3.caf');
var sound = Titanium.Media.createSound({
    sound:file, 
    preload:true, 
    volume:1.0
});
 
// VOLUME ON
 
Ti.App.addEventListener('volume_up', function()
{
    if (sound.volume < 1.0)
    {
        sound.volume = 1.0;
    }
});
 
// VOLUME OFF
 
Ti.App.addEventListener('volume_down', function()
{
    if (sound.volume > 0)
    {
        sound.volume = 0.0;
    }
});
 
sound.play();