     3, 
     1
   );
-  
-  for (i=0;i<NUM_LEDS;i++){
-      leds[i] = CHSV(hue, bufr[i], bufr[i]/brightnessFactor);
+
+  // Channel 1
+  for (i=0;i<NUM_LEDS_CH1;i++){
+      leds1[i] = CHSV(hue, bufr[i], bufr[i]/brightnessFactor);
+  }
+
+  // Channel 2
+  for (i=0;i<NUM_LEDS_CH2;i++){
+      leds2[i] = CHSV(hue, bufr[0], bufr[0]/brightnessFactor);
   }
   
   FastLED.show();

 * with the idea that low movement means colder and less bright colours,
 * with more movement turning it into warmer and brighter colours.
 * 
 * TODO Integrate pluse meter
 * 
 * Credit to Ben Nolan for the heart beat LED logic.
 * And for lending me some Neopixels to play around with!
 */
 
#define BAUD_RATE 57600
#define NUM_LEDS 120
#define DATA_PIN 12
#define ACCELX_PIN 0
#define ACCELY_PIN 2
#define ACCELZ_PIN 4
#define PULSE_PIN 6

// config
int staticBpm = 35; // From http://ecg.utah.edu/img/items/Normal%2012_Lead%20ECG.jpg
byte beat[]  = {3,2,2,2,2,3,4,3,2,1,0,15,2,2,3,4,6,8,5,3,3,3};
byte beatLength = 22;
int movesPerBeat = 8;
int minMagnitude = 80;
int maxMagnitude = 150;
int minBrightness = 10; // from 0-255
int maxBrightness = 100; // from 0-255
int minHue = 160; // hue value under low motion
int maxHue = 255; // hue value under high motion
int gainRatePerBeat = 200; // value change towards new target value (per beat)
int decayRatePerBeat = 1; // percent change towards new target per beat
int sampleSize = 8; // smooth out accelerometer readings

// state
int bpm = staticBpm;
byte bufr[NUM_LEDS];
byte offset = 0;
int targetMagnitude = minMagnitude;
int adjustedMagnitude = minMagnitude;

volatile boolean pulseBeatFound = false; // becomes true when Arduoino finds a beat.
volatile boolean hasPulse = false; // 

CRGB leds1[NUM_LEDS_CH1];
CRGB leds2[NUM_LEDS_CH2];

void setup() { 
      FastLED.addLeds<NEOPIXEL, LED_PIN_CH1>(leds1, NUM_LEDS_CH1);
      FastLED.addLeds<NEOPIXEL, LED_PIN_CH2>(leds2, NUM_LEDS_CH2);
      Serial.begin(BAUD_RATE);
      interruptSetup();

      pinMode(CTRL_LED_RED_PIN, OUTPUT);
      pinMode(CTRL_LED_GREEN_PIN, OUTPUT);
      pinMode(CTRL_LED_BLUE_PIN, OUTPUT);
      pinMode(BUTTON_PIN, INPUT_PULLUP);
      
      modeButton.attach(BUTTON_PIN);
      modeButton.interval(5);
}

void moveBuffer() {
  int i;
  byte c = (int) beat[offset] * 255 / beatLength;
  int midPoint = NUM_LEDS_CH1/2;

  // Move current beat intensity from middle to beginning of strip (backward in buffer)
  bufr[midPoint - 1] = c;
  for (i=0;i<midPoint - 1;i++){
    bufr[i] = bufr[i+1];
  }

  // Move current beat intensity from middle to end of strip (forward in buffer)
  bufr[midPoint] = c;
  for (i=NUM_LEDS_CH1 - 1;i>midPoint;i--){
    bufr[i] = bufr[i-1];
  }
}

