diff --git a/examples/waver/common.cpp b/examples/waver/common.cpp
index 7740d98..e3efec3 100644
--- a/examples/waver/common.cpp
+++ b/examples/waver/common.cpp
@@ -664,6 +664,8 @@ void renderMain() {
     static bool lastMouseButtonLeft = 0;
     static bool isTextInput = false;
     static bool scrollMessagesToBottom = true;
+    static bool hasAudioCaptureData = false;
+    static bool hasNewMessages = false;
 
     static double tStartInput = 0.0f;
     static double tEndInput = -100.0f;
@@ -679,9 +681,11 @@ void renderMain() {
         if (stateCurrent.flags.newMessage) {
             scrollMessagesToBottom = true;
             messageHistory.push_back(std::move(stateCurrent.message));
+            hasNewMessages = true;
         }
         if (stateCurrent.flags.newSpectrum) {
             spectrumCurrent = std::move(stateCurrent.spectrum);
+            hasAudioCaptureData = !spectrumCurrent.empty();
         }
         if (stateCurrent.flags.newTxAmplitudeData) {
             txAmplitudeDataCurrent = std::move(stateCurrent.txAmplitudeData);
@@ -750,8 +754,17 @@ void renderMain() {
     }
     ImGui::SameLine();
 
-    if (ImGui::ButtonSelectable(ICON_FA_COMMENT_ALT "  Messages", { 0.35f*ImGui::GetContentRegionAvailWidth(), menuButtonHeight }, windowId == WindowId::Messages)) {
-        windowId = WindowId::Messages;
+    {
+        auto posSave = ImGui::GetCursorScreenPos();
+        if (ImGui::ButtonSelectable(ICON_FA_COMMENT_ALT "  Messages", { 0.35f*ImGui::GetContentRegionAvailWidth(), menuButtonHeight }, windowId == WindowId::Messages)) {
+            windowId = WindowId::Messages;
+        }
+        auto radius = 0.3f*ImGui::GetTextLineHeight();
+        posSave.x += 2.0f*radius;
+        posSave.y += 2.0f*radius;
+        if (hasNewMessages) {
+            ImGui::GetWindowDrawList()->AddCircleFilled(posSave, radius, ImGui::ColorConvertFloat4ToU32({ 1.0f, 0.0f, 0.0f, 1.0f }), 16);
+        }
     }
     ImGui::SameLine();
 
@@ -760,8 +773,15 @@ void renderMain() {
     }
     ImGui::SameLine();
 
-    if (ImGui::ButtonSelectable(ICON_FA_SIGNAL "  Spectrum", { 1.0f*ImGui::GetContentRegionAvailWidth(), menuButtonHeight }, windowId == WindowId::Spectrum)) {
-        windowId = WindowId::Spectrum;
+    {
+        auto posSave = ImGui::GetCursorScreenPos();
+        if (ImGui::ButtonSelectable(ICON_FA_SIGNAL "  Spectrum", { 1.0f*ImGui::GetContentRegionAvailWidth(), menuButtonHeight }, windowId == WindowId::Spectrum)) {
+            windowId = WindowId::Spectrum;
+        }
+        auto radius = 0.3f*ImGui::GetTextLineHeight();
+        posSave.x += 2.0f*radius;
+        posSave.y += 2.0f*radius;
+        ImGui::GetWindowDrawList()->AddCircleFilled(posSave, radius, hasAudioCaptureData ? ImGui::ColorConvertFloat4ToU32({ 0.0f, 1.0f, 0.0f, 1.0f }) : ImGui::ColorConvertFloat4ToU32({ 1.0f, 0.0f, 0.0f, 1.0f }), 16);
     }
 
     if (windowId == WindowId::Settings) {
@@ -865,6 +885,8 @@ void renderMain() {
         const float messagesHistoryHeigthMax = ImGui::GetContentRegionAvail().y - messagesInputHeight - 2.0f*style.ItemSpacing.x;
         float messagesHistoryHeigth = messagesHistoryHeigthMax;
 
+        hasNewMessages = false;
+
         // no automatic screen resize support for iOS
 #if defined(IOS) || defined(ANDROID)
         if (displaySize.x < displaySize.y) {
@@ -1444,7 +1466,7 @@ void renderMain() {
             ImGui::Text("FPS: %4.2f\n", ImGui::GetIO().Framerate);
             ImGui::SetCursorScreenPos(posSave);
         }
-        if (spectrumCurrent.empty() == false) {
+        if (hasAudioCaptureData) {
             auto wSize = ImGui::GetContentRegionAvail();
             ImGui::PushStyleColor(ImGuiCol_FrameBg, { 0.3f, 0.3f, 0.3f, 0.3f });
             if (statsCurrent.isReceiving) {
diff --git a/examples/waver/main.cpp b/examples/waver/main.cpp
index e0ce3fe..5c627c9 100644
--- a/examples/waver/main.cpp
+++ b/examples/waver/main.cpp
@@ -116,8 +116,8 @@ bool ImGui_EndFrame(SDL_Window * window) {
 bool ImGui_SetStyle() {
     ImGuiStyle & style = ImGui::GetStyle();
 
-    style.AntiAliasedFill = false;
-    style.AntiAliasedLines = false;
+    style.AntiAliasedFill = true;
+    style.AntiAliasedLines = true;
     style.WindowRounding = 0.0f;
 
     style.WindowPadding = ImVec2(8, 8);