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Change volume of a currently running program

See original GitHub issue

Is it possible to change the audio volume of a specific session/program (like Firefox)?

My current code allows me to change the volume of a device, but I can’t figure out how to change the volume of a program…

class Program
    {
        static void Main(string[] args)
        {

            try
            {
                MMDeviceEnumerator MMDE = new MMDeviceEnumerator();

                MMDeviceCollection DevCol = MMDE.EnumerateAudioEndPoints(DataFlow.All, DeviceState.Active);
                
                foreach (MMDevice dev in DevCol)
                {
                    try
                    {
                            var newVolume = (float)Math.Max(Math.Min(10, 100), 0) / (float)100;
                       
                            dev.AudioEndpointVolume.MasterVolumeLevelScalar = newVolume;

                            Debug.WriteLine("Volume of " + dev.DeviceFriendlyName + " is " + dev.AudioEndpointVolume.MasterVolumeLevelScalar.ToString());
                    }
                    catch (Exception ex)
                    {
                        Debug.WriteLine(dev.DeviceFriendlyName + " could not be muted " + ex);
                    }
                }
            }
            catch (Exception ex)
            {
                Debug.WriteLine("Error: " + ex.Message);
            }
                            Console.ReadKey();
       }
 }