BlizzyB Sine Ed. Firmware v0.2

/*
  BlizzyB Sine Ed. - Douglas Berdeaux 2014 (C) GNU
  Firmware version 0.2 (Still in BETA)
  This project requires a lot of knowledge about SD card reading and the TMRpcm library.
  Please see WeakNetLabs.com for more details.
   - WeakNetLabs@Gmail.com
*/
#include <SD.h> // preprocessor directives (header files)
#define SDPIN 10    // SD Card Pin for SeeedStudio SD Card Shield
#include <TMRpcm.h> // to play WAV files
#include <Keypad.h> // for the keypad
int b2600 = 14; // 2600Hz Supervisory Signalling button
File myFile; // create objects here from library classes
TMRpcm tmrpcm; // create sound playing object
char keys[4][4] = { // matrix layout used by the Keypad library
  {'1','2','3','a'},
  {'4','5','6','b'},
  {'7','8','9','c'},
  {'*','0','#','d'}
};
byte rowPins[4] = {5,4,3,2}; //connect to the row pinouts of the keypad
byte colPins[4] = {14,8,7,6}; //connect to the column pinouts of the keypad
Keypad keypad = Keypad(makeKeymap(keys),rowPins,colPins,4,4);

void setup(){
  pinMode(b2600, INPUT); // A1 2600 button
  tmrpcm.speakerPin = 9; //11 on Mega, 9 on Uno, Nano, etc
  tmrpcm.setVolume(3); // set volume here (test for distortion)
  tmrpcm.play("sounds/blusinbu.wav"); // start up sound
  delay(1000); // pause
  return;
}

void loop(){ // our main loop
  procButton(); // process input
  if(digitalRead(b2600)==HIGH){ // play 2600Hz if button pressed
    super(); // supervisory signalling
  }
  return;
}

void super(){ // this is it's own, for future expansion
  tmrpcm.play("sounds/blusin26.wav");
  return;
}

void procButton(void){
  char button = keypad.getKey();
  if (button){ // if a button was pressed
    int intB = button - 48; // get Blue Box element index
    if(intB>-1&&intB<10){ // 0-9
      char convert[2]; // these next few lines convert intB to char for sending
      String str;  //        filename string into the play method of the TMRpcm object
      str=String(intB);
      str.toCharArray(convert,2);
      char string[20] = "sounds/blusin0X.wav"; // X gets replaced
      string[14] = *convert;
      tmrpcm.play(string);
      delay(100);
    }else if(intB==-6){ // KP
      tmrpcm.play("sounds/blusinkp.wav");
    }else if(intB==-13){ // ST
      tmrpcm.play("sounds/blusinst.wav");
    }else if(intB==49){ // 2600 (Assigned to 'A' for now
      super();
    }
  }else{
    return; // no button pressed
  }
}