diff --git a/client/public/version.js b/client/public/version.js
index c393788..9256cb7 100644
--- a/client/public/version.js
+++ b/client/public/version.js
@@ -1,5 +1,5 @@
 // Maintainer-controlled web client version.
 // Format: YYYY.MM.DD Rn (example: 2026.02.20 R2)
-window.CHGRID_WEB_VERSION = "2026.02.21 R121";
+window.CHGRID_WEB_VERSION = "2026.02.21 R122";
 // Optional display timezone for timestamps. Falls back to America/Detroit if unset/invalid.
 window.CHGRID_TIME_ZONE = "America/Detroit";
diff --git a/client/src/items/itemRegistry.ts b/client/src/items/itemRegistry.ts
index 4178804..e0f6d45 100644
--- a/client/src/items/itemRegistry.ts
+++ b/client/src/items/itemRegistry.ts
@@ -74,14 +74,23 @@ export type ItemPropertyMetadata = {
 };
 
 const DEFAULT_ITEM_TYPE_TOOLTIPS: Record<ItemType, string> = {
-  radio_station: 'Streams audio from a URL and can emit directional sound on the grid.',
-  dice: 'Roll one or more dice and report each value plus total.',
-  wheel: 'Spin a wheel from a comma-delimited list of spaces.',
-  clock: 'Speaks the current time using its configured timezone and format.',
+  radio_station: 'Can play stations from the Internet. Tune multiple to the same station and they will sync up.',
+  dice: 'Great for drinking games or boredom.',
+  wheel: 'Spin to win fabulous prizes.',
+  clock: 'It tells the time. What did you think it did?',
+};
+
+const DEFAULT_GLOBAL_ITEM_PROPERTY_METADATA: Record<string, ItemPropertyMetadata> = {
+  useSound: { valueType: 'sound', tooltip: 'One-shot sound played when this item is used successfully.' },
+  emitSound: { valueType: 'sound', tooltip: 'Looping sound emitted from this item on the grid.' },
+  useCooldownMs: { valueType: 'number', tooltip: 'Global cooldown in milliseconds between uses for this item type.' },
+  emitRange: { valueType: 'number', tooltip: 'Maximum distance in squares where emitted audio can be heard.' },
+  directional: { valueType: 'boolean', tooltip: "Whether emitted audio favors the item's facing direction." },
 };
 
 const DEFAULT_ITEM_PROPERTY_METADATA: Record<ItemType, Record<string, ItemPropertyMetadata>> = {
   radio_station: {
+    ...DEFAULT_GLOBAL_ITEM_PROPERTY_METADATA,
     title: { valueType: 'text', tooltip: 'Display name spoken and shown for this item.' },
     streamUrl: { valueType: 'text', tooltip: 'Audio stream URL used by this radio.' },
     enabled: { valueType: 'boolean', tooltip: 'Turns playback on or off for this radio.' },
@@ -93,15 +102,18 @@ const DEFAULT_ITEM_PROPERTY_METADATA: Record<ItemType, Record<string, ItemProper
     emitRange: { valueType: 'number', tooltip: "Maximum distance in squares for this radio's emitted audio.", range: { min: 5, max: 20, step: 1 } },
   },
   dice: {
+    ...DEFAULT_GLOBAL_ITEM_PROPERTY_METADATA,
     title: { valueType: 'text', tooltip: 'Display name spoken and shown for this item.' },
     sides: { valueType: 'number', tooltip: 'Number of sides on each die.', range: { min: 1, max: 100, step: 1 } },
     number: { valueType: 'number', tooltip: 'How many dice to roll per use.', range: { min: 1, max: 100, step: 1 } },
   },
   wheel: {
+    ...DEFAULT_GLOBAL_ITEM_PROPERTY_METADATA,
     title: { valueType: 'text', tooltip: 'Display name spoken and shown for this item.' },
     spaces: { valueType: 'text', tooltip: 'Comma-delimited list of wheel spaces. Example: yes, no, maybe.' },
   },
   clock: {
+    ...DEFAULT_GLOBAL_ITEM_PROPERTY_METADATA,
     title: { valueType: 'text', tooltip: 'Display name spoken and shown for this item.' },
     timeZone: { valueType: 'list', tooltip: 'Timezone used when the clock speaks time.' },
     use24Hour: { valueType: 'boolean', tooltip: 'Use 24 hour format instead of AM/PM.' },
diff --git a/server/app/item_catalog.py b/server/app/item_catalog.py
index b38294c..e32b5de 100644
--- a/server/app/item_catalog.py
+++ b/server/app/item_catalog.py
@@ -131,14 +131,23 @@ ITEM_PROPERTY_OPTIONS: dict[str, tuple[str, ...]] = {
 }
 
 ITEM_TYPE_TOOLTIPS: dict[ItemType, str] = {
-    "radio_station": "Streams audio from a URL and can emit directional sound on the grid.",
-    "dice": "Roll one or more dice and report each value plus total.",
-    "wheel": "Spin a wheel from a comma-delimited list of spaces.",
-    "clock": "Speaks the current time using its configured timezone and format.",
+    "radio_station": "Can play stations from the Internet. Tune multiple to the same station and they will sync up.",
+    "dice": "Great for drinking games or boredom.",
+    "wheel": "Spin to win fabulous prizes.",
+    "clock": "It tells the time. What did you think it did?",
+}
+
+GLOBAL_ITEM_PROPERTY_METADATA: dict[str, dict[str, object]] = {
+    "useSound": {"valueType": "sound", "tooltip": "One-shot sound played when this item is used successfully."},
+    "emitSound": {"valueType": "sound", "tooltip": "Looping sound emitted from this item on the grid."},
+    "useCooldownMs": {"valueType": "number", "tooltip": "Global cooldown in milliseconds between uses for this item type."},
+    "emitRange": {"valueType": "number", "tooltip": "Maximum distance in squares where emitted audio can be heard."},
+    "directional": {"valueType": "boolean", "tooltip": "Whether emitted audio favors the item's facing direction."},
 }
 
 ITEM_TYPE_PROPERTY_METADATA: dict[ItemType, dict[str, dict[str, object]]] = {
     "radio_station": {
+        **GLOBAL_ITEM_PROPERTY_METADATA,
         "title": {"valueType": "text", "tooltip": "Display name spoken and shown for this item."},
         "streamUrl": {"valueType": "text", "tooltip": "Audio stream URL used by this radio."},
         "enabled": {"valueType": "boolean", "tooltip": "Turns playback on or off for this radio."},
@@ -166,6 +175,7 @@ ITEM_TYPE_PROPERTY_METADATA: dict[ItemType, dict[str, dict[str, object]]] = {
         },
     },
     "dice": {
+        **GLOBAL_ITEM_PROPERTY_METADATA,
         "title": {"valueType": "text", "tooltip": "Display name spoken and shown for this item."},
         "sides": {
             "valueType": "number",
@@ -179,6 +189,7 @@ ITEM_TYPE_PROPERTY_METADATA: dict[ItemType, dict[str, dict[str, object]]] = {
         },
     },
     "wheel": {
+        **GLOBAL_ITEM_PROPERTY_METADATA,
         "title": {"valueType": "text", "tooltip": "Display name spoken and shown for this item."},
         "spaces": {
             "valueType": "text",
@@ -186,6 +197,7 @@ ITEM_TYPE_PROPERTY_METADATA: dict[ItemType, dict[str, dict[str, object]]] = {
         },
     },
     "clock": {
+        **GLOBAL_ITEM_PROPERTY_METADATA,
         "title": {"valueType": "text", "tooltip": "Display name spoken and shown for this item."},
         "timeZone": {"valueType": "list", "tooltip": "Timezone used when the clock speaks time."},
         "use24Hour": {"valueType": "boolean", "tooltip": "Use 24 hour format instead of AM/PM."},