diff --git a/core/src/main/java/ai/z/openapi/service/audio/AudioSpeechRequest.java b/core/src/main/java/ai/z/openapi/service/audio/AudioSpeechRequest.java
index 8b88bf8..83d0242 100644
--- a/core/src/main/java/ai/z/openapi/service/audio/AudioSpeechRequest.java
+++ b/core/src/main/java/ai/z/openapi/service/audio/AudioSpeechRequest.java
@@ -50,4 +50,14 @@ public class AudioSpeechRequest extends CommonRequest implements ClientRequest<A
 	@JsonProperty("watermark_enabled")
 	private Boolean watermarkEnabled;
 
+	/**
+	 * Voice speed for speech generation
+	 */
+	private Float speed;
+
+	/**
+	 * Volume of the generated speech file
+	 */
+	private Float volume;
+
 }