diff --git a/src/hooks/useVoice.js b/src/hooks/useVoice.js
index e40f9b7..14cb7d2 100644
--- a/src/hooks/useVoice.js
+++ b/src/hooks/useVoice.js
@@ -44,25 +44,31 @@ export function useVoice() {
    * Generate speech from text
    * @param {string} text - Text to speak
    * @param {Object} options - Options
+   * @param {string} options.voice - Voice ID (optional)
    * @returns {Promise<string>} Audio URL
    */
   const generateSpeech = useCallback(async (text, options = {}) => {
-    const { cache = true } = options;
+    const { cache = true, voice } = options;
 
     // Check cache first
-    const cacheKey = `${text}_${voice}`;
+    const cacheKey = text;
     if (cache && audioCache.current.has(cacheKey)) {
       return audioCache.current.get(cacheKey);
     }
 
     try {
+      const requestBody = { text };
+      if (voice) {
+        requestBody.voice = voice;
+      }
+
       const response = await fetch(`${API_URL}/voice/tts`, {
         method: 'POST',
         headers: {
           'Content-Type': 'application/json',
         },
         credentials: 'include',
-        body: JSON.stringify({ text, voice }),
+        body: JSON.stringify(requestBody),
       });
 
       if (!response.ok) {