Nano IR Remote for DC Motors

#include "IRremote.h"

int receiver = 11;
int velocity1 = 100;
int velocity2 = 100;

int x;
int Power__ON = 0;

const int M1P1 = 7;
const int M1N1 = 8;

const int M2P2 = 9;
const int M2N2 = 10;

const int M1__Speed = 6;
const int M2__Speed = 5;

IRrecv irrecv(receiver);
decode_results results;

void setup()
{
  Serial.begin(9600);
  irrecv.enableIRIn();
  pinMode(M1P1, OUTPUT);
  pinMode(M1N1, OUTPUT);
  pinMode(M2P2, OUTPUT);
  pinMode(M2N2, OUTPUT);
  pinMode(M1__Speed, OUTPUT);
  pinMode(M2__Speed, OUTPUT);
}
void loop()
{
  if (irrecv.decode(&results))
  {
    x = results.value & 0x0000ff;
    Serial.println(results.value, HEX);
    processIR();
    irrecv.resume();
  }
 
}
void processIR()
{
  if (x == 0x1f) //previous
  {
    Serial.println("Motor 1 rotates forward");
    digitalWrite(M1P1, HIGH);
    digitalWrite(M1N1, LOW);
    analogWrite(M1__Speed, velocity1);
  }
  else if (x == 0x57) //next
  {
    Serial.println("Motor 2 rotates forward");
    digitalWrite(M2P2, LOW);
    digitalWrite(M2N2, HIGH);
    analogWrite(M2__Speed, velocity2);
  }
  else if (x == 0x5d) //turn on
  {
    Power__ON = Power__ON + 1;
    int x = Power__ON % 2;
    Serial.println(x);
    if (x == 0)
    {
      Serial.println("Both Motor goes OFF");
      digitalWrite(M1P1, LOW);
      digitalWrite(M1N1, LOW);
      digitalWrite(M1P1, LOW);
      digitalWrite(M1N1, LOW);
      analogWrite(M1__Speed, 0);
      analogWrite(M2__Speed, 0);

    }
    else
    {
      Serial.println("Both Motor ready to run");
      digitalWrite(M1P1, HIGH);
      digitalWrite(M1N1, LOW);
      digitalWrite(M1P1, HIGH);
      digitalWrite(M1N1, LOW);
    }
  }
  else if (x == 0x67) // vol+
  {
    velocity1 = velocity1 + 10;
    analogWrite(M1__Speed, velocity1);
    Serial.println(velocity1);
  }
  else if (x == 0x97) // vol-
  {
    velocity1 = velocity1 - 10;
    analogWrite(M1__Speed, velocity1);
    Serial.println(velocity1);
  }
  else if (x == 0xdd) //mode
  {
    velocity2 = velocity2 + 10;
    analogWrite(M2__Speed, velocity2);
    Serial.println(velocity2);
  }
  else if (x == 0x3d) //equ
  {
    velocity2 = velocity2 - 10;
    analogWrite(M2__Speed, velocity2);
    Serial.println(velocity2);
  }
  else
  {

  }
  delay(500);
}