Urgent help needed, AS3 Audio buttons multi audio files internal and external

Hello, everyone.

I'm new to the forum and I need some help quickly,

I have multiple audio files some internal and extrenal files.

I made a button to mute all sounds, but it's not what I want.

I need two buttons ,

one to stop only the backgroundsoundtrack.mp3 audio file  and one to stop all sound except the backgroundsoundtrack.mp3 audio file

pls help as I need to finish this soon, it's for my graduation project.

I will be very grateful if you can help me finish this in two days time at most.

this is the code of the all sound stop button.

btn_mute.addEventListener(MouseEvent.CLICK, fl_ClickToPlayStopSound_29);

var fl_SC_29:SoundChannel;

//This variable keeps track of whether you want to play or stop the sound
var fl_ToPlay_29:Boolean = true;

function fl_ClickToPlayStopSound_29(evt:MouseEvent):void
{
if(fl_ToPlay_29)
{
var s:Sound = new Sound(new URLRequest("sounds/backgroundsoundtrack.mp3"));
fl_SC_29 = s.play();
mutte.gotoAndStop(1);
}
else
{
fl_SC_29.stop();
mutte.gotoAndStop(2);
}
fl_ToPlay_29 = !fl_ToPlay_29;
}