diff --git a/CLAUDE.md b/CLAUDE.md
index 8830928..9d11471 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -103,7 +103,7 @@ All detectors support: `AGGREGATOR_URL`, `CHECK_INTERVAL`, `THRESHOLD_WARNING`,
 | `emote` | No | Custom emote to display |
 | `color` | No | Custom color (hex, e.g., `#FF9900`) |
 | `animation` | No | One of: `breathing`, `shaking`, `popping`, `celebrating`, `floating`, `bouncing`, `swaying` |
-| `sound` | No | One of: `chime`, `alert`, `warning`, `critical`, `success`, `notify`, `doorbell`, `knock`, `ding`, `blip`, `siren`, `tada`, `ping`, `bubble`, `fanfare`, `alarm`, `none` |
+| `sound` | No | One of: `chime`, `alert`, `warning`, `critical`, `success`, `notify`, `doorbell`, `knock`, `ding`, `blip`, `siren`, `tada`, `ping`, `bubble`, `fanfare`, `alarm`, `klaxon`, `none` |
 
 ## Priority System
 
@@ -123,7 +123,6 @@ The optimal state face is set once per day on `/wake` (random pick). Each mornin
 | Emote | Animation | Vibe |
 |-------|-----------|------|
 | `( ^_^)` | breathing | calm |
-| `( ˙▿˙)` | floating | content |
 | `(◕‿◕)` | bouncing | cheerful |
 | `( ・ω・)` | swaying | curious |
 | `( ˘▽˘)` | breathing | cozy |
@@ -177,6 +176,7 @@ Use in automations:
 ├── kao.py              # Unified entry point
 ├── aggregator.py       # Event broker/API server
 ├── index.html          # OLED-optimized frontend
+├── kao_tui.py          # Developer TUI for testing sounds/events
 ├── config.json         # Runtime configuration
 ├── openapi.yaml        # API documentation (OpenAPI 3.0)
 ├── detectors/
diff --git a/README.md b/README.md
index e64c355..2d45b43 100644
--- a/README.md
+++ b/README.md
@@ -194,7 +194,7 @@ automation:
 - `emote`: Any ASCII emote (e.g., `( °o°)`, `\\(^o^)/`)
 - `color`: Hex color (e.g., `#FF9900`)
 - `animation`: `breathing`, `shaking`, `popping`, `celebrating`, `floating`, `bouncing`, `swaying`
-- `sound`: `chime`, `alert`, `warning`, `critical`, `success`, `notify`, `doorbell`, `knock`, `ding`, `blip`, `siren`, `tada`, `ping`, `bubble`, `fanfare`, `alarm`, `none`
+- `sound`: `chime`, `alert`, `warning`, `critical`, `success`, `notify`, `doorbell`, `knock`, `ding`, `blip`, `siren`, `tada`, `ping`, `bubble`, `fanfare`, `alarm`, `klaxon`, `none`
 
 ## Developer TUI
 
@@ -206,7 +206,7 @@ python kao_tui.py http://192.168.1.x:5100  # custom URL
 ```
 
 Four tabs:
-- **Sounds** — fire any of the 17 sounds via `/notify`
+- **Sounds** — fire any of the 18 sounds via `/notify`
 - **Faces** — send any preset emote/animation combo via `/notify`
 - **Events** — post Critical/Warning/Notify events (10s TTL) or clear all
 - **Controls** — Sleep, Wake, Clear all
@@ -245,7 +245,7 @@ The emote has personality! In optimal state it:
 - Critical: urgent descending tone
 - Notify: gentle ping
 - Recovery: happy ascending chirp
-- 10 additional synthesized sounds for `/notify`: `doorbell`, `knock`, `ding`, `blip`, `siren`, `tada`, `ping`, `bubble`, `fanfare`, `alarm` (alarm loops until tapped)
+- 11 additional synthesized sounds for `/notify`: `doorbell`, `knock`, `ding`, `blip`, `siren`, `tada`, `ping`, `bubble`, `fanfare`, `alarm`, `klaxon` (alarm and klaxon loop until tapped)
 
 ## License
 
diff --git a/index.html b/index.html
index 5ea3845..823c7f3 100644
--- a/index.html
+++ b/index.html
@@ -217,7 +217,7 @@
 			const emoteEl = document.getElementById("emote");
 			const messageEl = document.getElementById("message");
 			const POLL_INTERVAL = 2000;
-			const VERSION = "v2.1.0";
+			const VERSION = "v2.2.0";
 
 			// Sound system
 			let audioCtx = null;
@@ -254,9 +254,9 @@
 			}
 
 			function playWarningSound() {
-				// Soft double-beep
-				playTone(440, 0.15);
-				setTimeout(() => playTone(440, 0.15), 180);
+				// Two-tone warning beep - differentiated pitches
+				playTone(440, 0.2, "sine", 0.18);
+				setTimeout(() => playTone(550, 0.2, "sine", 0.18), 220);
 			}
 
 			function playCriticalSound() {
@@ -334,8 +334,8 @@
 				playTone(1047, 0.15, "sine", 0.1);
 			}
 			function playBubbleSound() {
-				playTone(400, 0.06, "sine", 0.06);
-				setTimeout(() => playTone(600, 0.04, "sine", 0.04), 40);
+				playTone(400, 0.15, "sine", 0.10);
+				setTimeout(() => playTone(650, 0.12, "sine", 0.08), 100);
 			}
 			function playFanfareSound() {
 				playTone(523, 0.1, "sine", 0.1);
@@ -364,9 +364,28 @@
 				}
 			}
 
+			// Klaxon — looping wah-wah horn, loops until manually stopped
+			let klaxonInterval = null;
+			function playKlaxonTick() {
+				playTone(500, 0.22, "sawtooth", 0.22);
+				setTimeout(() => playTone(380, 0.22, "sawtooth", 0.22), 230);
+			}
+			function startKlaxon() {
+				if (klaxonInterval) return;
+				playKlaxonTick();
+				klaxonInterval = setInterval(playKlaxonTick, 470);
+			}
+			function stopKlaxon() {
+				if (klaxonInterval) {
+					clearInterval(klaxonInterval);
+					klaxonInterval = null;
+				}
+			}
+
 			// Play sound by name
 			function playSoundByName(name) {
-				if (name === "alarm") { startAlarm(); return; }
+				if (name === "alarm")  { startAlarm();  return; }
+				if (name === "klaxon") { startKlaxon(); return; }
 				const sounds = {
 					chime: playChimeSound,
 					alert: playAlertSound,
@@ -403,7 +422,8 @@
 					playSoundByName(customSound);
 					lastCustomSound = customSound;
 				} else if (!customSound) {
-					stopAlarm();          // stop any looping alarm
+					stopAlarm();          // stop any looping sounds
+					stopKlaxon();
 					lastCustomSound = null;
 				}
 
@@ -434,7 +454,8 @@
 
 			// Handle tap - enable sound and show reaction
 			document.body.addEventListener("click", () => {
-				stopAlarm();  // stop any looping alarm
+				stopAlarm();   // stop any looping sounds
+				stopKlaxon();
 				// Enable sound on first tap (browser autoplay policy)
 				if (!soundEnabled) {
 					soundEnabled = true;
diff --git a/kao_tui.py b/kao_tui.py
index 1f2b44d..3efcbdd 100644
--- a/kao_tui.py
+++ b/kao_tui.py
@@ -11,7 +11,7 @@ BASE_URL = sys.argv[1].rstrip("/") if len(sys.argv) > 1 else "http://localhost:5
 SOUNDS = [
     "chime", "alert", "warning", "critical", "success", "notify",
     "doorbell", "knock", "ding", "blip", "siren", "tada",
-    "ping", "bubble", "fanfare", "alarm", "none",
+    "ping", "bubble", "fanfare", "alarm", "klaxon", "none",
 ]
 
 FACES = [
@@ -43,12 +43,12 @@ CONTROLS = [
 ]
 
 
-def post(path: str, data: dict | None = None) -> bool:
+def post(path: str, data: dict | None = None) -> tuple[bool, str]:
     try:
         resp = requests.post(f"{BASE_URL}/{path}", json=data or {}, timeout=5)
-        return resp.ok
-    except Exception:
-        return False
+        return resp.ok, "" if resp.ok else f"HTTP {resp.status_code}: {resp.text[:80]}"
+    except Exception as e:
+        return False, str(e)
 
 
 class KaoTUI(App):
@@ -95,37 +95,37 @@ class KaoTUI(App):
 
         if item_id.startswith("sound-"):
             name = item_id[len("sound-"):]
-            ok = post("notify", {"message": f"sound: {name}", "sound": name, "duration": 5})
-            self.notify(f"♪ {name} {'sent' if ok else 'FAILED'}", severity="information" if ok else "error")
+            ok, err = post("notify", {"message": f"sound: {name}", "sound": name, "duration": 2})
+            self.notify(f"♪ {name} sent" if ok else f"♪ {name} FAILED: {err}", severity="information" if ok else "error")
 
         elif item_id.startswith("face-"):
             desc = item_id[len("face-"):]
             face = next((f for f in FACES if f["desc"] == desc), None)
             if face:
-                ok = post("notify", {
+                ok, err = post("notify", {
                     "emote": face["emote"],
                     "animation": face["animation"],
                     "color": face["color"],
                     "message": f"face: {face['desc']}",
-                    "duration": 5,
+                    "duration": 2,
                 })
-                self.notify(f"{face['emote']} {face['desc']} {'sent' if ok else 'FAILED'}", severity="information" if ok else "error")
+                self.notify(f"{face['emote']} {face['desc']} sent" if ok else f"{face['desc']} FAILED: {err}", severity="information" if ok else "error")
 
         elif item_id.startswith("event-"):
             suffix = item_id[len("event-"):]
             if suffix == "clearall":
-                ok = post("clear-all")
-                self.notify(f"clear-all {'sent' if ok else 'FAILED'}", severity="information" if ok else "error")
+                ok, err = post("clear-all")
+                self.notify("clear-all sent" if ok else f"clear-all FAILED: {err}", severity="information" if ok else "error")
             else:
                 ev = next((e for e in EVENTS if e["id"] == suffix), None)
                 if ev:
-                    ok = post("event", {"id": ev["id"], "priority": ev["priority"], "message": ev["message"], "ttl": 10})
-                    self.notify(f"{ev['label'].strip()} {'sent' if ok else 'FAILED'}", severity="information" if ok else "error")
+                    ok, err = post("event", {"id": ev["id"], "priority": ev["priority"], "message": ev["message"], "ttl": 10})
+                    self.notify(f"{ev['label'].strip()} sent" if ok else f"{ev['label'].strip()} FAILED: {err}", severity="information" if ok else "error")
 
         elif item_id.startswith("ctrl-"):
             action = item_id[len("ctrl-"):]
-            ok = post(action)
-            self.notify(f"{action} {'sent' if ok else 'FAILED'}", severity="information" if ok else "error")
+            ok, err = post(action)
+            self.notify(f"{action} sent" if ok else f"{action} FAILED: {err}", severity="information" if ok else "error")
 
 
 if __name__ == "__main__":
diff --git a/openapi.yaml b/openapi.yaml
index 2426eba..8066b9d 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -14,7 +14,7 @@ info:
     ## TTL/Heartbeat Pattern
     Events can have a TTL (time-to-live) that auto-expires them. Detectors typically send
     heartbeat events that expire if not refreshed, indicating loss of communication.
-  version: 1.5.0
+  version: 2.2.0
   license:
     name: MIT
 
@@ -323,6 +323,7 @@ components:
             - bubble
             - fanfare
             - alarm
+            - klaxon
             - none
           example: "chime"