Add settings for fallback behavior

update action icon with padding

src/FocusVolumeControl/AudioSessions/SystemSoundsAudioSession.cs

@@ -0,0 +1,38 @@
+using CoreAudio;
+using System;
+
+namespace FocusVolumeControl.AudioSessions;
+
+internal class SystemSoundsAudioSession : IAudioSession
+{
+	public SystemSoundsAudioSession(SimpleAudioVolume volumeControl)
+	{
+		_volumeControl = volumeControl;
+	}
+
+	SimpleAudioVolume _volumeControl;
+
+	public string DisplayName => "System sounds";
+	public string GetIcon() => "Images/systemSounds";
+
+	public void ToggleMute()
+	{
+		_volumeControl.Mute = !_volumeControl.Mute;
+	}
+
+	public bool IsMuted() => _volumeControl.Mute;
+
+	public void IncrementVolumeLevel(int step, int ticks)
+	{
+		var level = _volumeControl.MasterVolume;
+
+		level += (0.01f * step) * ticks;
+		level = Math.Max(level, 0);
+		level = Math.Min(level, 1);
+
+		_volumeControl.MasterVolume = level;
+	}
+
+	public int GetVolumeLevel() => (int)(_volumeControl.MasterVolume * 100);
+
+}