Hi Claus. Welcome. Adding to what Barry posted, I think if you socket the resistor pad and try both, you will find R6 works on the loudness of the balance pot. My Killer Bee is awesome and I used the 24k since that was on hand when I built it. On this forum you will frequently see the term “Socket and see”! It gives the option of trying different components before having to solder and de-solder components. Hope this is helpful.