diff --git a/SerialInterface.cpp b/SerialInterface.cpp
index 427c184812..3d95fbbc16 100644
--- a/SerialInterface.cpp
+++ b/SerialInterface.cpp
@@ -72,14 +72,15 @@ int read_sensors(int first_measurement, float * avg_adc_channels, int * adc_chan
             //  At end - Extract value from string to variables
             if (serial_buffer[0] != 'p')
             {
-                sscanf(serial_buffer, "%d %d %d %d %d %d %d", 
+                sscanf(serial_buffer, "%d %d %d %d %d %d %d %d",    /* Needs to match Num Channels */
                        &adc_channels[0], 
                        &adc_channels[1], 
                        &adc_channels[2], 
                        &adc_channels[3],
                        &adc_channels[4],
                        &adc_channels[5],
-                       &adc_channels[6]);
+                       &adc_channels[6],
+                       &adc_channels[7]);
                 for (int i = 0; i < NUM_CHANNELS; i++)
                 {
                     if (!first_measurement)
diff --git a/SerialInterface.h b/SerialInterface.h
index 87e51d9cb5..e2bb82fde1 100644
--- a/SerialInterface.h
+++ b/SerialInterface.h
@@ -9,7 +9,7 @@
 int init_port (int baud);
 int read_sensors(int first_measurement, float * avg_adc_channels, int * adc_channels);
 
-#define NUM_CHANNELS 7
+#define NUM_CHANNELS 8
 #define SERIAL_PORT_NAME "/dev/tty.usbmodem411"
 
 #endif
diff --git a/audio.cpp b/audio.cpp
index 13f6d54ec9..5e8e57ff88 100644
--- a/audio.cpp
+++ b/audio.cpp
@@ -149,7 +149,7 @@ bool Audio::init()
                                2,       // output channels
                                paFloat32, // sample format
                                44100,   // sample rate (hz)
-                               256,     // frames per buffer
+                               512,     // frames per buffer
                                audioCallback, // callback function
                                (void*)data);  // user data to be passed to callback
     if (err != paNoError) goto error;
diff --git a/hardware/head_hand/head_hand.pde b/hardware/head_hand/head_hand.pde
index 3719d5ba45..7e4bb60955 100644
--- a/hardware/head_hand/head_hand.pde
+++ b/hardware/head_hand/head_hand.pde
@@ -2,11 +2,19 @@
 Read a set of analog input lines and echo their readings over the serial port with averaging 
 */
 
+//  ADC PIN MAPPINGS 
+//
+//  0, 1 =   Head Pitch, Yaw gyro 
+//  2,3,4    =  Head Accelerometer
+//  10,11,12 = Hand Accelerometer
+
 #define NUM_CHANNELS 8
 #define AVERAGE_COUNT 100
+#define TOGGLE_LED_SAMPLES 1000
 
 int inputPins[NUM_CHANNELS] = {0,1,2,3,4,10,11,12};
 
+
 int measured[NUM_CHANNELS];
 float accumulate[NUM_CHANNELS];
 
@@ -28,7 +36,7 @@ void loop()
   int i;
   sampleCount++; 
   for (i = 0; i < NUM_CHANNELS; i++) {
-    if (sampleCount % NUM_SAMPLES == 0) {
+    if (sampleCount % AVERAGE_COUNT == 0) {
       measured[i] = accumulate[i] / AVERAGE_COUNT;
       SerialUSB.print(measured[i]);
       SerialUSB.print(" ");
@@ -37,7 +45,8 @@ void loop()
       accumulate[i] += analogRead(inputPins[i]);
     }
   }
-  if (sampleCount % NUM_SAMPLES == 0) SerialUSB.println("");
+  if (sampleCount % AVERAGE_COUNT == 0) SerialUSB.println("");
+  if (sampleCount % TOGGLE_LED_SAMPLES == 0) toggleLED();
 }
 
 
diff --git a/interface.xcodeproj/project.xcworkspace/xcuserdata/philip.xcuserdatad/UserInterfaceState.xcuserstate b/interface.xcodeproj/project.xcworkspace/xcuserdata/philip.xcuserdatad/UserInterfaceState.xcuserstate
index 8cfc080bbe..9a297636f2 100644
Binary files a/interface.xcodeproj/project.xcworkspace/xcuserdata/philip.xcuserdatad/UserInterfaceState.xcuserstate and b/interface.xcodeproj/project.xcworkspace/xcuserdata/philip.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/main.cpp b/main.cpp
index abdb8e5bc8..5aa33a44ab 100644
--- a/main.cpp
+++ b/main.cpp
@@ -469,13 +469,14 @@ void update_pos(float frametime)
     
     //  Update hand/manipulator location for measured forces from serial channel
     const float MIN_HAND_ACCEL = 30.0;
-    glm::vec3 hand_accel(avg_adc_channels[4] - adc_channels[4],
-                         avg_adc_channels[5] - adc_channels[5],
-                         avg_adc_channels[6] - adc_channels[6]);
+    const float HAND_FORCE_SCALE = 0.5;
+    glm::vec3 hand_accel(-(avg_adc_channels[6] - adc_channels[6]),
+                         -(avg_adc_channels[7] - adc_channels[7]),
+                         -(avg_adc_channels[5] - adc_channels[5]));
     
     if (glm::length(hand_accel) > MIN_HAND_ACCEL)
     {
-        myHand.addVel(hand_accel*frametime);
+        myHand.addVel(frametime*hand_accel*HAND_FORCE_SCALE);
     }
                        
     //  Update render direction (pitch/yaw) based on measured gyro rates