It will work may have to play with it a  little but that's the fun part. low pass and a op-amp and 2 volts above 10 should go 10 to 0 volts

Na some one here used a magic wand with there crystal ball

Here a nice link to give a understanding of sound and they have a nice link to a real good preamp
http://courses.oliviarobinson.com/wt/node/79

Never could figure wHy we need a crystal ball now I NO

Do you have the remote that sit's on the dash of the car

Just put a diode coming from the positive side of the battery it will drop you down enough to make
the receiver work  
4 AAA one diode makes 5.3 volts and will keep you from hooking the battery's wrong   

Well if some one told you you can't walk would you sit in a chair. I wouldn't I would try to walk.
You'll never no if you can or not But if you use a part like what I said the output is going to be good

A 26 Gauge wire is 1.3 amps enclosed and 2.2 amps open air 28 is almost a amp

Yep you need power Just make sure you tie the grounds to the remote Ground to the ground on the arduino need to be tied.

And you don't hook the emitter to any thing but the switch low side and it will work  

Here I made a video showing the hack. I'm toggling the npn with the battery for now

There will be a loss of about  .7 volts  use a logic level fet like the 2n7000
You shouldn't need a filter on the line most of these can use AC or DC but then most I've seen are 24 volt for HVAC dampers

Yours is a lot easier to figure out then My board you can see thee parts. lol
Just place the NPN pins collector and emitter to ground and hook the base to the arduino with a resistor 1k or higher and you should be able to make it work just as the button did.  

Your button is easy if you test it one side is high and one side should be ground just solder the collector to the high side of the button and solder the emitter to the low side of the button and you'll be good to go

Let me show you what i'm saying

Here some code to test 13 button wired up as I posted 

Code:

const int keyMin = 0;      // Keymin, discovered through experiment
const int keyMax = 1023;    // keymax, discovered through experiment
void setup() {
  Serial.begin(9600);
}
void loop() {
  // read the sensor:
  int key = analogRead(A0);
  // map the sensor range to a range of four options:
  int keyValue = map(key, keyMin, keyMax, 0, 3);

  // do something different depending on the
  // range value:
  switch (keyValue) {
  case 0:    // your hand is on the sensor
    Serial.println("button1");
    break;
  case 1:    // your hand is close to the sensor
    Serial.println("button2");
    break;
  case 2:    // your hand is a few inches from the sensor
    Serial.println("button3");
    break;
  case 3:    // your hand is nowhere near the sensor
    Serial.println("button4t");
    break;
    case 4:    // your hand is nowhere near the sensor
    Serial.println("button5");
    break;
case 5:    // your hand is nowhere near the sensor
    Serial.println("button6");
    break;
case 6:    // your hand is nowhere near the sensor
    Serial.println("button7");
    break;
case 7:    // your hand is nowhere near the sensor
    Serial.println("button8");
    break;
case 8:    // your hand is nowhere near the sensor
    Serial.println("button9");
    break;
case 9:    // your hand is nowhere near the sensor
    Serial.println("button10");
    break;
case 10:    // your hand is nowhere near the sensor
    Serial.println("button11");
    break;
case 11:    // your hand is nowhere near the sensor
    Serial.println("button12");
    break;
case 12:    // your hand is nowhere near the sensor
    Serial.println("button13");
    break;

  }
  delay(1);        // delay in between reads for stability
}

You got her right just use the transistor as a switch you shouldn't need a resistor on the collector
but I would look see what's on your button

Dang that did the job I had that in there but I removed it some how Thanks

I'm getting    undefined reference to `setup'
But I don't see why  using 1.0.2 ide

Code:

const int keyMin = 0;      // Keymin, discovered through experiment
const int keyMax = 600;    // keymax, discovered through experiment
void loop() {
  // read the sensor:
  int key = analogRead(A0);
  // map the sensor range to a range of four options:
  int keyValue = map(key, keyMin, keyMax, 0, 3);

  // do something different depending on the
  // range value:
  switch (keyValue) {
  case 0:    // your hand is on the sensor
    Serial.println("button1");
    break;
  case 1:    // your hand is close to the sensor
    Serial.println("button2");
    break;
  case 2:    // your hand is a few inches from the sensor
    Serial.println("button3");
    break;
  case 3:    // your hand is nowhere near the sensor
    Serial.println("button4t");
    break;
  }
  delay(1);        // delay in between reads for stability
}