This Single Control Splitter block splits one input into multiple outputs, with a single knob control for all the output gains. Two outputs is the default (see right), but right-click the block edge to grow it up to any number of outputs, max 15.
To set the output gain, click the knob with the left mouse button and drag while holding down the button. The knob's range, value, and step size can be customized in the control pop-up window. To change the knob's settings, right-click on the knob control.
Additional outputs can be created by growing the algorithm, Right-click and select Grow Algorithm from the menu. Up to 15 outputs maximum can be created.