Hi, so I got max on my mac. I installed it and added the patch and all of the stuff appeared on my MAX program such as the slider. I then uploaded the code below onto the arduino. I put it in lock mode then tried moving the slider. It did not work. And I had the LED between pin 9 and ground. I have no clue what is wrong? I also tried checking the box and sliding it and unchecking it and sliding it? Any ideas guys 
:D! Thanks!
const int ledPin = 9; // the pin that the LED is attached to
void setup()
{
// initialize the serial communication:
Serial.begin(9600);
// initialize the ledPin as an output:
pinMode(ledPin, OUTPUT);
}
void loop() {
byte brightness;
// check if data has been sent from the computer:
if (Serial.available()) {
// read the most recent byte (which will be from 0 to 255):
brightness = Serial.read();
// set the brightness of the LED:
analogWrite(ledPin, brightness);
}
}