Add host mute indicator to status bar (see #2308)

src/BizHawk.Client.EmuHawk/MainForm.Events.cs

@@ -822,6 +822,7 @@ namespace BizHawk.Client.EmuHawk
 			}
 			Sound.StartSound();
 			RewireSound();
+			UpdateStatusBarMuteIndicator();
 		}
 
 		private void AutofireMenuItem_Click(object sender, EventArgs e)

src/BizHawk.Client.EmuHawk/MainForm.cs

@@ -57,6 +57,8 @@ namespace BizHawk.Client.EmuHawk
 
 		private readonly ToolStripMenuItemEx NullHawkVSysSubmenu = new() { Enabled = false, Text = "—" };
 
+		private readonly StatusLabelEx StatusBarMuteIndicator = new();
+
 		private readonly StatusLabelEx StatusBarRewindIndicator = new()
 		{
 			Image = Properties.Resources.RewindRecord,
@@ -220,6 +222,10 @@ namespace BizHawk.Client.EmuHawk
 				button.MouseLeave += SlotStatusButtons_MouseLeave;
 			}
 
+			StatusBarMuteIndicator.Click += (_, _) => ToggleSound();
+			MainStatusBar.Items.InsertBefore(KeyPriorityStatusLabel, insert: StatusBarMuteIndicator);
+			UpdateStatusBarMuteIndicator();
+
 			if (OSTailoredCode.IsUnixHost)
 			{
 				// workaround for https://github.com/mono/mono/issues/12644
@@ -2589,6 +2595,7 @@ namespace BizHawk.Client.EmuHawk
 			Config.SoundEnabled = !Config.SoundEnabled;
 			Sound.StopSound();
 			Sound.StartSound();
+			UpdateStatusBarMuteIndicator();
 		}
 
 		private void VolumeUp()
@@ -2822,6 +2829,11 @@ namespace BizHawk.Client.EmuHawk
 			}
 		}
 
+		private void UpdateStatusBarMuteIndicator()
+			=> (StatusBarMuteIndicator.Image, StatusBarMuteIndicator.ToolTipText) = Config.SoundEnabled
+				? (Properties.Resources.Audio, $"Core is producing audio, live playback at {(Config.SoundEnabledNormal ? Config.SoundVolume : 0)}% volume")
+				: (Properties.Resources.AudioMuted, "Core is not producing audio");
+
 		private void UpdateStatusBarRewindIndicator()
 			=> StatusBarRewindIndicator.Visible = Rewinder?.Active is true;
 

src/BizHawk.Client.EmuHawk/Properties/Resources.cs

@@ -48,6 +48,7 @@ namespace BizHawk.Client.EmuHawk.Properties
 		internal static readonly Bitmap ArrowBlackDown = ReadEmbeddedBitmap("arrow_black_down");
 		internal static readonly Lazy<Bitmap> AtariController = new Lazy<Bitmap>(() => ReadEmbeddedBitmap("atari_controller"));
 		internal static readonly Bitmap Audio = ReadEmbeddedBitmap("AudioHS");
+		internal static readonly Bitmap AudioMuted = ReadEmbeddedBitmap("AudioMuted");
 		internal static readonly Bitmap AutoSearch = ReadEmbeddedBitmap("AutoSearch");
 		internal static readonly Bitmap Avi = ReadEmbeddedBitmap("AVI");
 		internal static readonly Bitmap Back = ReadEmbeddedBitmap("Back");