--- a/src/lib/Chat.luan	Fri Aug 15 23:24:38 2025 +0900
+++ b/src/lib/Chat.luan	Sat Aug 16 09:56:10 2025 +0900
@@ -31,9 +31,10 @@
 		language = doc.language
 		tts_instructions = doc.tts_instructions
 		voice = doc.voice
-		show_text = doc.show_text == "true"
+		show_text = doc.show_text
 		autoplay = doc.autoplay == "true"
 		is_private = doc.is_private == "true"
+		has_ruby = doc.has_ruby == "true"
 	}
 end
 
@@ -49,16 +50,16 @@
 		language = chat.language or error()
 		tts_instructions = chat.tts_instructions -- or error()
 		voice = chat.voice or error()
-		show_text = chat.show_text and "true" or "false"
+		show_text = chat.show_text
 		autoplay = chat.autoplay and "true" or "false"
 		is_private = chat.is_private and "true" or nil
+		has_ruby = chat.has_ruby and "true" or nil
 	}
 end
 
 function Chat.new(chat)
 	chat.updated = chat.updated or time_now()
 	chat.voice = chat.voice or voices[1]
-	if chat.show_text==nil then chat.show_text = true end
 	if chat.autoplay==nil then chat.autoplay = true end
 
 	function chat.save()
@@ -103,8 +104,32 @@
 		Ai_chat.output_system_prompt(chat.ai_thread)
 	end
 
+	local function option(name,text)
+		local selected = name==chat.show_text and " selected" or ""
+%>
+						<option <%=name%><%=selected%>><%=text%></option>
+<%
+	end
+
+	local function assistant_controls()
+		return `%>
+				<div controls>
+					<audio controls preload=none></audio>
+					<select>
+<%
+						option("show_text","Show text")
+			if chat.has_ruby then
+						option("hide_ruby","Hide pronunciation")
+			end
+						option("hide_text","Hide text")
+%>
+					</select>
+				</div>
+<%		`
+	end
+
 	function chat.output_messages_html()
-		Ai_chat.output_messages_html(chat.show_text,chat.ai_thread)
+		Ai_chat.output_messages_html(assistant_controls(),chat.ai_thread)
 	end
 
 	function chat.ask(input)
@@ -115,7 +140,7 @@
 			chat.ai_thread = ai_thread
 			chat.save()
 		end )
-		return `Ai_chat.output_messages_html(chat.show_text,ai_thread,old_thread)`
+		return `Ai_chat.output_messages_html(assistant_controls(),ai_thread,old_thread)`
 	end
 
 	function chat.language_name()