diff --git a/README.md b/README.md
index 9fa82d1..c5a0684 100644
--- a/README.md
+++ b/README.md
@@ -45,7 +45,8 @@ stdin.
 
 ### Key bindings
 
-- <kbd>F1</kbd>: toggle voice transmission
+- <kbd>F1</kbd>: toggle deafen (mute + deaf)
+- <kbd>F4</kbd>: toggle voice transmission
 - <kbd>Ctrl+L</kbd>: clear chat log
 - <kbd>Tab</kbd>: toggle focus between chat and user tree
 - <kbd>Page Up</kbd>: scroll chat up
diff --git a/barnard.go b/barnard.go
index af24b66..ccb6c4b 100644
--- a/barnard.go
+++ b/barnard.go
@@ -23,7 +23,8 @@ type Barnard struct {
 	TreeWidth int
 	LogFile   *os.File
 
-	Stream *gumbleopenal.Stream
+	Stream       *gumbleopenal.Stream
+	transmitting bool
 
 	Ui            *uiterm.Ui
 	UiOutput      uiterm.Textview
diff --git a/ui.go b/ui.go
index 20661f0..7248b43 100644
--- a/ui.go
+++ b/ui.go
@@ -44,18 +44,56 @@ func (b *Barnard) AddOutputMessage(sender *gumble.User, message string) {
 	}
 }
 
-func (b *Barnard) OnVoiceToggle(ui *uiterm.Ui, key uiterm.Key) {
-	if b.UiStatus.Text == "  Tx  " {
+func (b *Barnard) updateStatus() {
+	if b.Client == nil || b.Client.Self == nil {
+		return
+	}
+	if b.Client.Self.SelfDeafened {
+		b.UiStatus.Text = " Deaf "
+		b.UiStatus.Fg = uiterm.ColorWhite | uiterm.AttrBold
+		b.UiStatus.Bg = uiterm.ColorBlue
+	} else if b.transmitting {
+		b.UiStatus.Text = "  Tx  "
+		b.UiStatus.Fg = uiterm.ColorWhite | uiterm.AttrBold
+		b.UiStatus.Bg = uiterm.ColorRed
+	} else {
 		b.UiStatus.Text = " Idle "
 		b.UiStatus.Fg = uiterm.ColorBlack
 		b.UiStatus.Bg = uiterm.ColorWhite
+	}
+}
+
+func (b *Barnard) OnDeafenToggle(ui *uiterm.Ui, key uiterm.Key) {
+	if b.Client == nil || b.Client.Self == nil {
+		return
+	}
+	deaf := !b.Client.Self.SelfDeafened
+	b.Client.Self.SetSelfDeafened(deaf)
+	if deaf && b.transmitting {
+		b.transmitting = false
+		b.Stream.StopSource()
+	}
+	b.debugf("deafen=%v", deaf)
+	b.updateStatus()
+	ui.Refresh()
+}
+
+func (b *Barnard) OnVoiceToggle(ui *uiterm.Ui, key uiterm.Key) {
+	if b.Client == nil || b.Client.Self == nil {
+		return
+	}
+	if b.Client.Self.SelfDeafened {
+		return
+	}
+	if b.transmitting {
+		b.transmitting = false
 		b.Stream.StopSource()
 	} else {
-		b.UiStatus.Fg = uiterm.ColorWhite | uiterm.AttrBold
-		b.UiStatus.Bg = uiterm.ColorRed
-		b.UiStatus.Text = "  Tx  "
+		b.transmitting = true
 		b.Stream.StartSource()
 	}
+	b.debugf("transmit=%v", b.transmitting)
+	b.updateStatus()
 	ui.Refresh()
 }
 
@@ -150,7 +188,8 @@ func (b *Barnard) OnUiInitialize(ui *uiterm.Ui) {
 	ui.Add(uiViewTree, &b.UiTree)
 
 	b.Ui.AddKeyListener(b.OnFocusPress, uiterm.KeyTab)
-	b.Ui.AddKeyListener(b.OnVoiceToggle, uiterm.KeyF1)
+	b.Ui.AddKeyListener(b.OnDeafenToggle, uiterm.KeyF1)
+	b.Ui.AddKeyListener(b.OnVoiceToggle, uiterm.KeyF4)
 	b.Ui.AddKeyListener(b.OnQuitPress, uiterm.KeyF10)
 	b.Ui.AddKeyListener(b.OnClearPress, uiterm.KeyCtrlL)
 	b.Ui.AddKeyListener(b.OnScrollOutputUp, uiterm.KeyPgup)