diff --git a/README.md b/README.md
index 2b64f1e..3310f14 100644
--- a/README.md
+++ b/README.md
@@ -153,10 +153,11 @@ not available.
   Note that audio will be played to the previously created virtual sound card
   regardless of this setting.
 - `space`: toggles PTT and audio stream recording from the default sound
-  device.
+  device
 
   You can transmit your own voice using a mic attached to your computer for
   example.
+- `t`: toggles the tune process
 
 ## Authors
 
diff --git a/civcontrol.go b/civcontrol.go
index 81139a0..c074ab4 100644
--- a/civcontrol.go
+++ b/civcontrol.go
@@ -1,11 +1,19 @@
 package main
 
-import "math"
+import (
+	"math"
+	"time"
+)
 
 const civAddress = 0xa4
 
 type civControlStruct struct {
 	st *serialStream
+
+	state struct {
+		ptt  bool
+		tune bool
+	}
 }
 
 var civControl *civControlStruct
@@ -26,6 +34,8 @@ func (s *civControlStruct) decode(d []byte) {
 		s.decodeFreq(payload)
 	case 0x04:
 		s.decodeMode(payload)
+	case 0x1a:
+		s.decodeDataMode(payload)
 	case 0x14:
 		s.decodePower(payload)
 	case 0x1c:
@@ -47,6 +57,18 @@ func (s *civControlStruct) decodeFreq(d []byte) {
 	statusLog.reportFrequency(f)
 }
 
+func (s *civControlStruct) decodeFilterValue(v byte) string {
+	switch v {
+	case 0x01:
+		return "FIL1"
+	case 0x02:
+		return "FIL2"
+	case 0x03:
+		return "FIL3"
+	}
+	return ""
+}
+
 func (s *civControlStruct) decodeMode(d []byte) {
 	if len(d) < 1 {
 		return
@@ -78,16 +100,27 @@ func (s *civControlStruct) decodeMode(d []byte) {
 
 	var filter string
 	if len(d) > 1 {
-		switch d[1] {
-		case 0x01:
-			filter = "FIL1"
-		case 0x02:
-			filter = "FIL2"
-		case 0x03:
-			filter = "FIL3"
-		}
+		filter = s.decodeFilterValue(d[1])
 	}
 	statusLog.reportMode(mode, filter)
+
+	// The transceiver does not send the data mode setting automatically.
+	_ = s.getDataMode()
+}
+
+func (s *civControlStruct) decodeDataMode(d []byte) {
+	if len(d) < 3 || d[0] != 0x06 {
+		return
+	}
+
+	var dataMode string
+	var filter string
+	if d[1] == 1 {
+		dataMode = "-D"
+		filter = s.decodeFilterValue(d[2])
+	}
+
+	statusLog.reportDataMode(dataMode, filter)
 }
 
 func (s *civControlStruct) decodePower(d []byte) {
@@ -106,19 +139,26 @@ func (s *civControlStruct) decodeTransmitStatus(d []byte) {
 		return
 	}
 
-	var ptt bool
-	var tune bool
 	switch d[0] {
 	case 0:
 		if d[1] == 1 {
-			ptt = true
+			s.state.ptt = true
+		} else {
+			s.state.ptt = false
 		}
 	case 1:
 		if d[1] == 2 {
-			tune = true
+			s.state.tune = true
+
+			// The transceiver does not send the tune state after it's finished.
+			time.AfterFunc(time.Second, func() {
+				_ = s.getTransmitStatus()
+			})
+		} else {
+			s.state.tune = false
 		}
 	}
-	statusLog.reportPTT(ptt, tune)
+	statusLog.reportPTT(s.state.ptt, s.state.tune)
 }
 
 func (s *civControlStruct) setPTT(enable bool) error {
@@ -129,6 +169,31 @@ func (s *civControlStruct) setPTT(enable bool) error {
 	return s.st.send([]byte{254, 254, civAddress, 224, 0x1c, 0, b, 253})
 }
 
+func (s *civControlStruct) toggleTune() error {
+	if s.state.ptt {
+		return nil
+	}
+
+	var b byte
+	if !s.state.tune {
+		b = 2
+	} else {
+		b = 1
+	}
+	return s.st.send([]byte{254, 254, civAddress, 224, 0x1c, 1, b, 253})
+}
+
+func (s *civControlStruct) getDataMode() error {
+	return s.st.send([]byte{254, 254, civAddress, 224, 0x1a, 0x06, 253})
+}
+
+func (s *civControlStruct) getTransmitStatus() error {
+	if err := s.st.send([]byte{254, 254, civAddress, 224, 0x1c, 0, 253}); err != nil {
+		return err
+	}
+	return s.st.send([]byte{254, 254, civAddress, 224, 0x1c, 1, 253})
+}
+
 func (s *civControlStruct) init(st *serialStream) error {
 	s.st = st
 
@@ -140,12 +205,14 @@ func (s *civControlStruct) init(st *serialStream) error {
 	if err := s.st.send([]byte{254, 254, civAddress, 224, 4, 253}); err != nil {
 		return err
 	}
+	if err := s.getDataMode(); err != nil {
+		return err
+	}
 	// Querying power.
 	if err := s.st.send([]byte{254, 254, civAddress, 224, 0x14, 0x0a, 253}); err != nil {
 		return err
 	}
-	// Querying PTT.
-	if err := s.st.send([]byte{254, 254, civAddress, 224, 0x1c, 0, 253}); err != nil {
+	if err := s.getTransmitStatus(); err != nil {
 		return err
 	}
 	return nil
diff --git a/keyboard-linux.go b/keyboard-linux.go
index 48ceff4..590c559 100644
--- a/keyboard-linux.go
+++ b/keyboard-linux.go
@@ -18,6 +18,12 @@ func (s *keyboardStruct) handleKey(k byte) {
 		audio.togglePlaybackToDefaultSoundcard()
 	case ' ':
 		audio.toggleRecFromDefaultSoundcard()
+	case 't':
+		if civControl != nil {
+			if err := civControl.toggleTune(); err != nil {
+				log.Error("can't toggle tune: ", err)
+			}
+		}
 	}
 }
 
diff --git a/statuslog.go b/statuslog.go
index 953ee42..5757d41 100644
--- a/statuslog.go
+++ b/statuslog.go
@@ -17,6 +17,7 @@ type statusLogData struct {
 	stateStr   string
 	frequency  float64
 	mode       string
+	dataMode   string
 	filter     string
 	txPowerStr string
 
@@ -119,6 +120,19 @@ func (s *statusLogStruct) reportMode(mode, filter string) {
 	s.data.filter = filter
 }
 
+func (s *statusLogStruct) reportDataMode(dataMode, filter string) {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+
+	if s.data == nil {
+		return
+	}
+	s.data.dataMode = dataMode
+	if dataMode != "" {
+		s.data.filter = filter
+	}
+}
+
 func (s *statusLogStruct) reportPTT(ptt, tune bool) {
 	s.mutex.Lock()
 	defer s.mutex.Unlock()
@@ -179,7 +193,7 @@ func (s *statusLogStruct) update() {
 
 	var modeStr string
 	if s.data.mode != "" {
-		modeStr = " " + s.data.mode
+		modeStr = " " + s.data.mode + s.data.dataMode
 	}
 	var filterStr string
 	if s.data.filter != "" {