The Stereo Mixer mixes two or more stereo input channels to a single stereo output. Each stereo input's mix level can be independently adjusted.
There are two control knobs for setting the gain, one knob for each pair of input pins. To set the gain, click the knob with the left mouse button and drag while holding the button down. Each knob's range, value, and step size can be customized by right-clicking on the knob control.
To add additional stereo inputs, perform a Grow Algorithm on this block, right-click and select Grow Algorithm from the menu, as shown below. A maximum of 15 stereo inputs is supported.