Using 1 Arduino to create 2 unique PWM signals (up to 25 kHz)

void loop(){

  for(unsigned int x = 1; x < 90; x++){

    OCR1A = x;

    OCR1B = OCR1A-1;

    delay (map(analogRead(3),0,1023,0,30));

  }

}

ISR(TIMER1_OVF_vect){                   // Timer1 overflow interrupt service routine

  PORTB |= _BV(PORTB2);                 // Turn LED (pin 13) on

}

ISR(TIMER1_COMPA_vect){                 // Timer1 compare interrupt service routine

  PORTB &= ~_BV(PORTB2);                // Turn LED off

}