I’ve just taken a step and counted 2 boxes for my Silver 12. A closed one and a BR. But now I can change the volume and the tuning frequency. What’s it got to do with it. And what’s this Vent do. And what do we have to look like in this case better. Closed or BR. I don’t look through it. Closed: Yellow BR: Green Greeting Mathiaswww.cibis-online.de/public/Silverwinisd.bmp