I'm writing a sketch to create a virtual mixer for a small touchscreen monitor. The program is going to control a mixer board complete with digital pots, buffers, op-amps and all that good stuff via an Arduino. Just looking for some insight as to if I'm headed in the right direction. I feel like the mouse functions could be abbreviated with a loop, but I'm not sure how to go about it.

int numOfsliders = 5;
int buttonWidth = 40;
int buttonHeight = 20;
int level[] = {300, 350, 400, 300, 350};
int sliderX[] = {100, 225,  350, 475, 600};


void setup()
{
  rectMode(CENTER);
  size (640, 480);
}

void draw()
{
  background(20);
  //Channel 1
  drawChannel(sliderX[0],level[0]);
  //Channel 2
  drawChannel(sliderX[1],level[1]);
  //Channel 3
  drawChannel(sliderX[2],level[2]);
  //Channel4
  drawChannel(sliderX[3],level[3]);
  //Channel5
  drawChannel(sliderX[4],level[4]);
}

void drawSlider(int xPos)
{
  //Draws slider and all the cute lines to make it look pretty
  fill(50);
  stroke(50);
  rect(xPos, 240, 20, 400);
  stroke(0);
  strokeWeight(4);
  line(xPos, 50, xPos, 430);
  strokeWeight(1);
  for(int i = 430; i > 40; i -= 15)
    {
      line(xPos - 10, i, xPos - 7, i);
      line(xPos+10, i, xPos+7, i);
    }
}

void drawChannel(int xPos, int level)
{
  drawSlider(xPos);
  drawVumeter(xPos);
  //Draw slider knobs
  fill(255);
  rect(xPos, level, buttonWidth, buttonHeight);
  line(xPos - buttonWidth / 2, level, xPos + buttonWidth / 2, level);
  //Draws shaded lines on the sliders
  for(int i = 0; i < 5; i++)
  {
    stroke(i * 60);
    line(xPos - buttonWidth / 2, level + i * 2, xPos + buttonWidth / 2, level + i * 2);
    line(xPos - buttonWidth / 2, level - i * 2, xPos + buttonWidth / 2, level - i * 2);
  }
}

void drawVumeter(int xPos)
{
  //Draw rectangles for VU meter and color
  for(int j = 440; j > 40; j -= 10)
  {
    if(j > 150)
      fill(20, 80, 20);
     
    else if(j > 100)
      fill(80, 80, 20);
   
    else
      fill(80, 20, 20);
     
    rect(xPos-40, j-5, 20, 10);
  }
}

void mouseDragged()
{
  //Decide if mouse is dragging a slider and which
  for(int j = 0; j < numOfsliders; j++){
       if (mouseX > sliderX[j] - (buttonWidth / 2) &&
           mouseX < sliderX[j] + (buttonWidth / 2) &&
           mouseY > 40 && mouseY < 440)
          {
           level[j]= mouseY;
          }
  }
 
}

void mouseClicked()
{
  ////Decide if mouse is clicking a slider and which
  for(int j = 0; j < numOfsliders; j++){
       if (mouseX > sliderX[j] - (buttonWidth / 2) &&
           mouseX < sliderX[j] + (buttonWidth / 2) &&
           mouseY > 40 && mouseY < 440)
          {
           level[j]= mouseY;
          }
  }
 
}