Can Java Sound be used to control the system volume?

Question

Java Sound offers FloatControl instances for various sound line functionality, and both a MASTER_GAIN & VOLUME control type.

Can these controls be

Answer 1

add following line just after Line is initialized. this is required to open the line.

boolean opened = line.isOpen() || line instanceof Clip;
if(!opened){
    System.out.println("Line is not open, trying to open it...");
    line.open();
    opened = true;
}