diff --git a/Code/devterm_keyboard/devterm_keyboard.ino b/Code/devterm_keyboard/devterm_keyboard.ino
index aeba312..f5b9521 100644
--- a/Code/devterm_keyboard/devterm_keyboard.ino
+++ b/Code/devterm_keyboard/devterm_keyboard.ino
@@ -5,7 +5,7 @@
 
 #include <USBComposite.h>
 
-#define SER_NUM_STR "20210515"
+#define SER_NUM_STR "20210531"
 
 USBHID HID;
 DEVTERM dev_term;
diff --git a/Code/devterm_keyboard/trackball.h b/Code/devterm_keyboard/trackball.h
index 289fa2b..7438ea1 100644
--- a/Code/devterm_keyboard/trackball.h
+++ b/Code/devterm_keyboard/trackball.h
@@ -5,10 +5,12 @@
 
 #include "keys_io_map.h"
 
-#define BOUNCE_INTERVAL       100
-#define BASE_MOVE_PIXELS      3
-#define EXPONENTIAL_BOUND     10
+/*
+#define BOUNCE_INTERVAL       30 
+#define BASE_MOVE_PIXELS      5  
+#define EXPONENTIAL_BOUND     15
 #define EXPONENTIAL_BASE      1.2
+*/
 
 #define BTN_PIN               KEY0
 #define RIGHT_PIN             HO3
@@ -16,7 +18,13 @@
 #define DOWN_PIN              HO4
 #define UP_PIN                HO2
 
-
+typedef struct _track_speed {
+  uint8_t bounce_interval;
+  uint8_t base_move_pixels;
+  uint8_t exponential_bound;
+  double  exponential_base;
+  
+}TrackSpeed;
 
 class Direction {
   public:
@@ -33,22 +41,24 @@ class Direction {
         this->current_action_times[i] = millis();
         if(this->current_actions[i] != this->last_actions[i]) {
           this->last_actions[i] = this->current_actions[i];
-          exponential = (EXPONENTIAL_BOUND - (this->current_action_times[i] - this->last_action_times[i]));
+          exponential = ( ts->exponential_bound - (this->current_action_times[i] - this->last_action_times[i]));
           exponential = (exponential > 0) ? exponential : 1;
-          move_multiply = EXPONENTIAL_BASE;
+          move_multiply = ts->exponential_base;
           for(int i = 0; i < exponential; ++i) {
-            move_multiply *= EXPONENTIAL_BASE;
+            move_multiply *= ts->exponential_base;
           }
           this->last_action_times[i] = this->current_action_times[i];
           if(i == 0) {
-            return (-1) * BASE_MOVE_PIXELS * move_multiply;
+            return (-1) * ts->base_move_pixels * move_multiply;
           } else {
-            return BASE_MOVE_PIXELS * move_multiply;
+            return ts->base_move_pixels * move_multiply;
           }
         }
       }
       return 0;
     };
+  
+  TrackSpeed *ts;
     
   private:
     int           pins[2];
@@ -58,6 +68,7 @@ class Direction {
     double        move_multiply;
     unsigned long current_action_times[2];
     unsigned long last_action_times[2];
+    
 };
 
 void trackball_init(DEVTERM*);
diff --git a/Code/devterm_keyboard/trackball.ino b/Code/devterm_keyboard/trackball.ino
index 7a4dad4..02373f7 100644
--- a/Code/devterm_keyboard/trackball.ino
+++ b/Code/devterm_keyboard/trackball.ino
@@ -22,12 +22,26 @@ int x_move, y_move;
 Direction x_direction(LEFT_PIN, RIGHT_PIN);
 Direction y_direction(UP_PIN, DOWN_PIN);
 
+TrackSpeed Normal_ts;
+TrackSpeed Detail_ts;
+TrackSpeed *ts_ptr;
+
 void trackball_task(DEVTERM*dv) {
+  
+  if(dv-> Keyboard_state.fn_on > 0) {
+    ts_ptr = &Detail_ts;
+  }else {
+    ts_ptr = &Normal_ts;
+  }
+
+  x_direction.ts = ts_ptr;
+  y_direction.ts = ts_ptr;
+  
   btn_read_state = digitalRead(BTN_PIN);
   
   if(btn_read_state != btn_state) {
     btn_current_action_time = millis();
-    if(btn_current_action_time - btn_last_action_time > BOUNCE_INTERVAL) {
+    if(btn_current_action_time - btn_last_action_time > ts_ptr->bounce_interval ) {
       btn_state = btn_read_state;
       btn_last_action_time = btn_current_action_time;
       
@@ -50,4 +64,16 @@ void trackball_task(DEVTERM*dv) {
 
 void trackball_init(DEVTERM*){
   pinMode(BTN_PIN,INPUT);
+
+  Normal_ts.bounce_interval = 30;
+  Normal_ts.base_move_pixels = 5;
+  Normal_ts.exponential_bound = 14;
+  Normal_ts.exponential_base = 1.2;
+
+  Detail_ts.bounce_interval = 100;
+  Detail_ts.base_move_pixels = 3;
+  Detail_ts.exponential_bound = 10;
+  Detail_ts.exponential_base = 1.2;
+
+  
 }