Processing + Arduino

I am connecting four stepper motors to arduino, controlled by processing (connected to touchOSC). I am trying to determine the best way to send information to independently control each motor.

Here is how im doing it: TouchOSC(on iphone) >> Processing >> arduino >> motors

Arduino receives a single number through serial connection! How can I distinguish different values and connect them to the proper motor?

Processing code****
/**

*/

import oscP5.;
import netP5.
;
import processing.serial.*;

Serial arduinoPort;
OscP5 oscP5;

float v_fader1 = 0.0f;
float v_fader2 = 0.0f;
float v_fader3 = 0.0f;
float v_fader4 = 0.0f;
float v_fader5 = 0.0f;
float v_toggle1 = 0.0f;
float v_toggle2 = 0.0f;
float v_toggle3 = 0.0f;
float v_toggle4 = 0.0f;

float v_fadera = 0;
float v_faderb = 0;
float v_faderc = 0;
float v_faderd = 0;

int int_fader1;
int int_fader2;
int int_fader3;
int int_fader4;

void setup() {
size(320,440);
frameRate(25);
/* start oscP5, listening for incoming messages at port 8000 */
oscP5 = new OscP5(this,8000);
arduinoPort=new Serial(this,Serial.list()[0],9600);
}

void oscEvent(OscMessage theOscMessage) {

String addr = theOscMessage.addrPattern();
float val = theOscMessage.get(0).floatValue();

if(addr.equals("/1/fader1")) {
v_fader1 = val;
}
else if(addr.equals("/1/fader2")) {
v_fader2 = val;
}
else if(addr.equals("/1/fader3")) {
v_fader3 = val;
}
else if(addr.equals("/1/fader4")) {
v_fader4 = val;
}
else if(addr.equals("/1/fader5")) {
v_fader5 = val;
}
else if(addr.equals("/1/toggle1")) {
v_toggle1 = val;
}
else if(addr.equals("/1/toggle2")) {
v_toggle2 = val;
}
else if(addr.equals("/1/toggle3")) {
v_toggle3 = val;
}
else if(addr.equals("/1/toggle4")) {
v_toggle4 = val;
}
}

void draw() {
background(0);

// fader5 + toggle 1-4 outlines
fill(0);
stroke(0, 196, 168);

rect(17,21,287,55);
rect(17,369,60,50);
rect(92,369,60,50);
rect(168,369,60,50);
rect(244,369,60,50);

// fader5 + toggle 1-4 fills
fill(0, 196, 168);
rect(17,21,v_fader5*287,55);
if(v_toggle1 == 1.0f) rect(22,374,50,40);
if(v_toggle2 == 1.0f) rect(97,374,50,40);
if(v_toggle3 == 1.0f) rect(173,374,50,40);
if(v_toggle4 == 1.0f) rect(249,374,50,40);

// fader 1-4 outlines
fill(0);
stroke(255, 237, 0);
rect(17,95,60,255);
rect(92,95,60,255);
rect(168,95,60,255);
rect(244,95,60,255);

// fader 1-4 fills
fill(255, 237, 0);
rect(17,95 + 255 - v_fader1255,60,v_fader1255);
rect(92,95 + 255 - v_fader2255,60,v_fader2255);
rect(168,95 + 255 - v_fader3255,60,v_fader3255);
rect(244,95 + 255 - v_fader4255,60,v_fader4255);

v_fadera = map(v_fader1, 0, 1,0, 200);
v_faderb = map(v_fader2, 0, 1,201, 400);
v_faderc = map(v_fader3, 0, 1,401, 600);
v_faderd = map(v_fader4, 0, 1,600, 800);

int_fader1 = int(v_fadera);
int_fader2 = int(v_faderb);
int_fader3 = int(v_faderc);
int_fader4 = int(v_faderd);

println(int_fader4);
// println(int_fader1);
// println(int_fader3);
// println(int_fader4);

// arduinoPort.write(int_fader1);
//arduinoPort.write(int_fader2);
//arduinoPort.write(int_fader3);
arduinoPort.write(int_fader4);

//arduinoPort.write(int_fader2);
//arduinoPort.write(int_fader3);
//arduinoPort.write(int_fader4);

//println(int_fader);
}

arduino code***
/*

#include <Stepper.h>

// change this to the number of steps on your motor
#define STEPS 100

// create an instance of the stepper class, specifying
// the number of steps of the motor and the pins it’s
// attached to
Stepper stepper1(STEPS, 2, 3, 4, 5);
Stepper stepper2(STEPS, 6, 7, 8, 9);
Stepper stepper3(STEPS, 10, 11, 12, 13);
Stepper stepper4(STEPS, A0, A1, A2, A3);

// the previous reading from the analog input
int previous = 0;

void setup()
{
// set the speed of the motor to 30 RPMs
stepper1.setSpeed(30);
stepper2.setSpeed(30);
stepper3.setSpeed(30);
stepper4.setSpeed(30);
// begin serial connection (readings)
Serial.begin(9600);
}

void loop()
{
if(Serial.available() > 0)
{

// get the sensor value
int val = Serial.read();

if (val <= 600){
val = val-600;
}

if (val >= 200){
stepper1.step(val-previous);
previous = val;
}

if (val < 200){
stepper4.step(val-previous);
previous = val;

}

//uncomment for manual testing
//stepper.step(-90);
//delay(500);

// remember the previous value of the sensor
// previous = val;
}
}

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Arduino receives a single number through serial connection!

Yes, that's how serial interfaces work.