Play, Stop, Pause, Resume and Volume control in Real-Time with Audio System Toolbox

So I am designing a GUI for an equalizer and have just made the buttons and sliders mentioned in the title. The thing is that I tried to make this with audioplayer's objects. The problem is that with the code that I am attaching this doesn't work in real-time. I read about Audio System Toolbox for this matter and I think I can play and stop audio without any problem, but I really can't think of a way to pause and resume and to chnge the volume with a slider in real-time. I hope soeone could guide me about this matter. I attach the code I used. Play, Stop, Puse, Resume:

 properties (Access = private)
        Property % Description
        fileName
        player
        
    end


    methods (Access = private)

        % Value changed function: PauseButton
        function PauseButtonValueChanged(app, event)
            value = app.PauseButton.Value;
            pause(app.player);
        end

        % Value changed function: PlayButton
        function PlayButtonValueChanged(app, event)
      value = app.PlayButton.Value;
        try
       [y, Fs] = audioread(app.fileName);
       app.player=audioplayer(app.Volume.Value*y,Fs);
       % Play audio
       play(app.player)
          
     catch ME
      uiwait(msgbox('Could not open that file with Audioread'));
        end
        end

        % Value changed function: ResumeButton
        function ResumeButtonValueChanged(app, event)
            value = app.ResumeButton.Value;
            try
            resume(app.player);
            catch ME
      uiwait(msgbox('Could not open that file with Audioread'));
            end
        end

        % Value changed function: StopButton
        function StopButtonValueChanged(app, event)
            value = app.StopButton.Value;
            try
            stop(app.player);
            catch ME
      uiwait(msgbox('Could not open that file with Audioread'));
            end
        end

And for the volume:

        function VolumeValueChanged(app, event)
            valueVol = app.Volume.Value;
            
            pause(app.player);
            NewStart=get(app.player,'CurrentSample')+1;
            stop(app.player);
            [x, Fs] = audioread(app.fileName);
            x=x(NewStart:end,:);
            app.player=audioplayer(x*valueVol,Fs);
            play(app.player);

I didn't include the code for the browser because it just opens the path of the file.

Answer 1

[Ayush Bansal]

A function to control audio volume directly is not available in MATLAB .

Workaround would be controlling system volume in the callback function.

[Alvaro Arellano]

One of the worst answers I've ever seen