diff --git a/YAOCMouse.ino b/YAOCMouse.ino
index 61fcf1d..8899edc 100644
--- a/YAOCMouse.ino
+++ b/YAOCMouse.ino
@@ -48,31 +48,38 @@ class MouseRptParser : public MouseReportParser
 
 void MouseRptParser::OnRightButtonUp  (MOUSEINFO *mi)
 {
+  Serial.println("BTN-R: UP");
   digitalWrite(PIN_MOUSE_RBTN, HIGH);
 };
 
 void MouseRptParser::OnRightButtonDown  (MOUSEINFO *mi)
 {
+  Serial.println("BTN-R: DOWN");
   digitalWrite(PIN_MOUSE_RBTN, LOW);
 };
 
 void MouseRptParser::OnLeftButtonDown  (MOUSEINFO *mi)
 {
+  Serial.println("BTN-L: DOWN");
   digitalWrite(PIN_MOUSE_LBTN, LOW);
 };
 
 void MouseRptParser::OnLeftButtonUp  (MOUSEINFO *mi)
 {
+  Serial.println("BTN-L: UP");
   digitalWrite(PIN_MOUSE_LBTN, HIGH);
 };
 
 void MouseRptParser::OnMiddleButtonDown  (MOUSEINFO *mi)
 {
+  Serial.println("BTN-M: DOWN");
   digitalWrite(PIN_MOUSE_MBTN, LOW);
+  Xchange+=16;
 };
 
 void MouseRptParser::OnMiddleButtonUp  (MOUSEINFO *mi)
 {
+  Serial.println("BTN-M: UP");
   digitalWrite(PIN_MOUSE_MBTN, HIGH);
 };