diff --git a/plugins/channel/demoddsd/dsddemodgui.ui b/plugins/channel/demoddsd/dsddemodgui.ui
index dcb70f6ec..912c55745 100644
--- a/plugins/channel/demoddsd/dsddemodgui.ui
+++ b/plugins/channel/demoddsd/dsddemodgui.ui
@@ -781,6 +781,42 @@
         </property>
        </spacer>
       </item>
+      <item>
+       <widget class="QToolButton" name="slot1On">
+        <property name="toolTip">
+         <string>TDMA slot1 voice on/off</string>
+        </property>
+        <property name="text">
+         <string/>
+        </property>
+        <property name="icon">
+         <iconset resource="../../../sdrbase/resources/res.qrc">
+          <normaloff>:/slot1_off.png</normaloff>
+          <normalon>:/slot1_on.png</normalon>:/slot1_off.png</iconset>
+        </property>
+        <property name="checkable">
+         <bool>true</bool>
+        </property>
+       </widget>
+      </item>
+      <item>
+       <widget class="QToolButton" name="slot2On">
+        <property name="toolTip">
+         <string>TDMA slot2 voice on/off</string>
+        </property>
+        <property name="text">
+         <string/>
+        </property>
+        <property name="icon">
+         <iconset resource="../../../sdrbase/resources/res.qrc">
+          <normaloff>:/slot2_off.png</normaloff>
+          <normalon>:/slot2_on.png</normalon>:/slot2_off.png</iconset>
+        </property>
+        <property name="checkable">
+         <bool>true</bool>
+        </property>
+       </widget>
+      </item>
      </layout>
     </item>
    </layout>
diff --git a/sdrbase/resources/res.qrc b/sdrbase/resources/res.qrc
index 96a4350c3..c59b33f70 100644
--- a/sdrbase/resources/res.qrc
+++ b/sdrbase/resources/res.qrc
@@ -58,5 +58,9 @@
     <file>recycle.png</file>
     <file>lsb.png</file>
     <file>constellation.png</file>
+    <file>slot1_off.png</file>
+    <file>slot1_on.png</file>
+    <file>slot2_off.png</file>
+    <file>slot2_on.png</file>
   </qresource>
 </RCC>
diff --git a/sdrbase/resources/slot1_off.png b/sdrbase/resources/slot1_off.png
new file mode 100644
index 000000000..2b8654360
Binary files /dev/null and b/sdrbase/resources/slot1_off.png differ
diff --git a/sdrbase/resources/slot1_on.png b/sdrbase/resources/slot1_on.png
new file mode 100644
index 000000000..4c0a46d5d
Binary files /dev/null and b/sdrbase/resources/slot1_on.png differ
diff --git a/sdrbase/resources/slot2_off.png b/sdrbase/resources/slot2_off.png
new file mode 100644
index 000000000..02053d9ce
Binary files /dev/null and b/sdrbase/resources/slot2_off.png differ
diff --git a/sdrbase/resources/slot2_on.png b/sdrbase/resources/slot2_on.png
new file mode 100644
index 000000000..6dbce5280
Binary files /dev/null and b/sdrbase/resources/slot2_on.png differ