unsigned long tempo;
unsigned long flash;
unsigned long debounce;
unsigned long debounce2;
unsigned long sixteenth;
unsigned long newTap;
unsigned long oldTap;
unsigned long pressed;
word tapAvg[33];
word glitch[9];
unsigned long temporary;
unsigned long elapsed;


unsigned long quarterNote = 500; // sets the default internal tempo, quarter notes, in milliseconds. 500 = 120BPM
word sixteenthNote;
int swingValue;
unsigned long sequence[300];
byte played[300];



byte recPins;
byte oldRecPins;
byte tempRecPins;
byte oldTempRecPins;
byte playPins;
byte switchPosition;
byte seqNum = 3;              // sets the default sequence number, change this ONLY when...
word seqLength;
word seqStep;
word oldStep;
byte triggered;
byte mute = B11111111;
byte extTap = 10;              // = 0 means external clock, = 1 means internal clock (10 or 11 means event timer mode)
byte rollOneshot = 1;         // = 0 means kepresses roll, = 1 means kepresses are one-shot
byte FSmode = 0;              // selects the default freestyle mode
const byte triggerLength = 8;  // sets how long triggers go HIGH. 10 is prplayPinsably the longest you want to do, 2 might be too short.
byte resetted;
unsigned long USreset;
byte tapped;
int tapNum = -9;
int oldTapNum;
byte UQFS = 10;
int glitchCounter;
byte pingPong;

int TV;
int TV2;




void setup() {
  //  SLselect();

  pinMode(0, INPUT_PULLUP);         //PIND  B0000000x (breaks when Serial is used)
  pinMode(1, OUTPUT);               //PORTD B000000x0 (breaks when Serial is used)

  pinMode(2,  INPUT_PULLUP);        //PIND B00000x00   button 1
  pinMode(3,  INPUT_PULLUP);        //PIND B0000x000          2
  pinMode(4,  INPUT_PULLUP);        //PIND B000x0000          3
  pinMode(5,  INPUT_PULLUP);        //PIND B00x00000          4
  pinMode(6,  INPUT_PULLUP);        //PIND B0x000000          5
  pinMode(7,  INPUT_PULLUP);        //PIND Bx0000000          6
  pinMode(8,  INPUT_PULLUP);        //PINB B0000000x          7
  pinMode(9,  INPUT_PULLUP);        //PINB B000000x0          8


  pinMode(10, OUTPUT);              //PORTB B00000x00  output 1
  pinMode(11, OUTPUT);              //PORTB B0000x000         2
  pinMode(12, OUTPUT);              //PORTB B000x0000         3
  pinMode(13, OUTPUT);              //PORTB B00x00000         4
  pinMode(A0, OUTPUT);              //PORTC B0000000x         5
  pinMode(A1, OUTPUT);              //PORTC B000000x0         6
  pinMode(A2, OUTPUT);              //PORTC B00000x00         7
  pinMode(A3, OUTPUT);              //PORTC B0000x000         8

  pinMode(A4, INPUT_PULLUP);        //PINC  B000x0000   clock trigger in
  pinMode(A5, OUTPUT);              //PORTC B00x00000   flashy light

//  Serial.begin(115200);

}

void loop() {

  recPins = PIND >> 2;
  recPins |= ((PINB << 6) & B11000000);
  recPins = ~recPins;


  if (recPins > oldRecPins) {
    if ((extTap == 10) || (extTap == 11)) {
      tempo = millis();
      extTap += 10;
      USreset = 65535;
      seqLength = 0;
      // stuff to delete the sequence
    }
    seqLength++;
    if (seqLength > 299) seqLength = 0;
    sequence[seqLength] = elapsed;
    playPins = recPins ^ oldRecPins;
    sequence[seqLength] |= (unsigned long)playPins << 16;
    flash = millis();
  }
  elapsed = ((millis() - tempo) & 65535); // this weird number leaves 16 zeros in the five MSBs of the variable
  if ((USreset == 65535) && (analogRead(A7) < 100)) {
    USreset = elapsed;
  }
  if (elapsed > USreset) {
    tempo = millis();
    for (int i = 0; i <= seqLength; i++) {
      bitWrite(sequence[i], 30, 0);
    PORTC |= B00100000;
    }
  }
  seqStep++;
  if (seqStep > seqLength) seqStep = 1;
  if (elapsed > (sequence[seqStep] & 65535) & (bitRead(sequence[seqStep], 30) == 0)) {
    playPins = (sequence[seqStep] >> 16);
    bitWrite(sequence[seqStep], 30, 1);
    flash = millis();
  }
//  if (elapsed > (sequence[seqStep] & 134217727)) Serial.println(seqStep);
  if (flash > 0) {
    PORTB |= (playPins << 2) & B00111100;
    PORTC |= (playPins >> 4) & B00001111;
  }
  if (millis() - flash > 20) {
    PORTB &= B11000011;
    PORTC &= B11010000;
    flash = 0;
  }








  oldRecPins = recPins;
}