Wert von TouchOSC auslesen und mit PWM subtrahieren

Hallo,
ich möchte gern einen Wert, den ich per TouchOSC sende, mit dem Wert von der PWM subtrahieren.
hier mal ein Beispiel:

String Helligkeit = "/2/fader1";

if(Push1==rcvMes->getZ_OSCAddress()){
analogWrite(6, 255);
analogWrite(5, 0);
analogWrite(3, 0);

Wenn ich mein Push1-Button drücke, ändert sich der Wert von Pin 6 von 0 auf 255. Um den Wert 255 abhängig von dem Wert des --->String Helligkeit = "/2/fader1"; <---- zu machen, fehlen mir ein paar Kenntnisse.

Ich hatte mir das so gedacht:

if(Push1==rcvMes->getZ_OSCAddress()){
analogWrite(6, 255 - (255/100) * (der Wert von --->String Helligkeit = "/2/fader1"<---);
analogWrite(5, 0);
analogWrite(3, 0);

Wie bekomme ich den Wert von --->String Helligkeit = "/2/fader1"; <---- deklariert, damit ich ihn über z.b. x oder y in meine Funktion hinein bekomme?
also dann so: analogWrite(6, 255 - (255/100) * x);

Freue mich über eure Antworten/Erfahrungen/Meinungen.

#include <SPI.h>
#include <Ethernet.h> // version IDE 0022
#include <Z_OSC.h>

byte myMac[] = { 0xDE, 0xAD, 0xBE, 0xFE, 0xFE, 0xED };
byte myIp[]  = { 192, 168, 178, 4 };
int  serverPort  = 8000;
byte gateway[] = { 192, 168, 178, 1 };    // ROUTER
byte subnet[] = {255, 255, 255, 0 };    // SUBNET
  

uint16_t i;
float floatValue;
Z_OSCServer server;
Z_OSCMessage *rcvMes;

void setup(){ 
 //Serial.begin(19200);
 Ethernet.begin(myMac ,myIp); 
 server.sockOpen(serverPort);
 //Serial.println("init"); 
 
 pinMode(7, OUTPUT);
 pinMode(3, OUTPUT);
 pinMode(5, OUTPUT);
 pinMode(6, OUTPUT);
 analogWrite(3,254);
  analogWrite(5,254);
   analogWrite(6,254);

}
  
void loop(){
 if(server.available()){
   Serial.println("empfang");
   rcvMes=server.getMessage();
   
   for(i=0 ; i<rcvMes->getArgsNum(); i++){
     switch( rcvMes->getTypeTag(i) ){
       case 'f':        
         floatValue = rcvMes->getFloat(i);
          
          String Push1 = "/2/push14"; 
          String Push2 = "/2/push22"; 
          String Push3 = "/2/push19"; 
          String Push4 = "/2/push17"; 
          String Push5 = "/2/push16"; 
          String Push6 = "/2/push24"; 
          String Push7 = "/2/push13"; 
          String Push8 = "/2/push18"; 
          String Push9 = "/2/push23"; 
          String Push10 = "/2/push15"; 
          String Push11 = "/2/push20"; 
          String Push12 = "/2/push21"; 
          String Helligkeit = "/2/fader1"; 
          String reset = "/LED/push26"; 
          String reset2 = "/2/push27"; 
          String OK = "/2/push12";    
          String LEDON = "/3/push1";
          String LEDOFF = "/3/push2";
          String blue = "/LED/fader3";
          String red = "/LED/fader1";
          String green = "/LED/fader2";
         if(blue==rcvMes->getZ_OSCAddress()){
           analogWrite(3,floatValue); 
         }
          if(red==rcvMes->getZ_OSCAddress()){
           analogWrite(6,floatValue); 
         }
         if(green==rcvMes->getZ_OSCAddress()){
          analogWrite(5,floatValue); 
        }
          if(LEDON==rcvMes->getZ_OSCAddress()){
          // ON
          digitalWrite(7,HIGH); 
         }
          if(LEDOFF==rcvMes->getZ_OSCAddress()){
          // OFF
          digitalWrite(7,LOW); 
          }
          if(Push1==rcvMes->getZ_OSCAddress()){
           analogWrite(6, 255); 
           analogWrite(5, 0);
           analogWrite(3, 0);
           }
          if(Push2==rcvMes->getZ_OSCAddress()){
           analogWrite(6, 255); 
           analogWrite(5, 96);
           analogWrite(3, 0);
           }
          if(Push3==rcvMes->getZ_OSCAddress()){
           analogWrite(6, 255); 
           analogWrite(5, 255);
           analogWrite(3, 0);
           }
          if(Push4==rcvMes->getZ_OSCAddress()){
           analogWrite(6, 96); 
           analogWrite(5, 255);
           analogWrite(3, 0);
           }
          if(Push5==rcvMes->getZ_OSCAddress()){
           analogWrite(6, 0); 
           analogWrite(5, 255);
           analogWrite(3, 0);
           }
           if(Push6==rcvMes->getZ_OSCAddress()){
           analogWrite(6, 0); 
           analogWrite(5, 255);
           analogWrite(3, 96);
           }
           if(Push7==rcvMes->getZ_OSCAddress()){
           analogWrite(6, 0); 
           analogWrite(5, 255);
           analogWrite(3, 255);
           }
           if(Push8==rcvMes->getZ_OSCAddress()){
           analogWrite(6, 0); 
           analogWrite(5, 96);
           analogWrite(3, 255);
           }
           if(Push9==rcvMes->getZ_OSCAddress()){
           analogWrite(6, 0); 
           analogWrite(5, 0);
           analogWrite(3, 255);
           }
           if(Push10==rcvMes->getZ_OSCAddress()){
           analogWrite(6, 96); 
           analogWrite(5, 0);
           analogWrite(3, 255);
           }
           if(Push11==rcvMes->getZ_OSCAddress()){
           analogWrite(6, 255); 
           analogWrite(5, 0);
           analogWrite(3, 255);
           }
           if(Push12==rcvMes->getZ_OSCAddress()){
           analogWrite(6, 255); 
           analogWrite(5, 0);
           analogWrite(3, 96);
           }
           
        if(reset==rcvMes->getZ_OSCAddress()){
           analogWrite(6, 0);
           analogWrite(5, 0);
           analogWrite(3, 0);
           analogWrite(7, 0);
           }
           if(reset2==rcvMes->getZ_OSCAddress()){
           analogWrite(6, 0);
           analogWrite(5, 0);
           analogWrite(3, 0);
           analogWrite(7, 0);
           }
          
}
       break; 
     }
   }
   
 }

Thanks! i used your code and it's ok.