> For the complete documentation index, see [llms.txt](https://docs.holoplot.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.holoplot.com/holoplot-plan/working-with-beams/creating-a-virtual-source/adjusting-virtual-source-parameters.md).

# Adjusting Virtual Source parameters

You can adjust the following parameters from the left side of the Properties Panel:

| Parameter          | Type of Interaction | Function                                                                                                                                                                                               |
| ------------------ | ------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| Type               | dropdown            | Defines the beam or Virtual Source type. Here, choose either V.Source - Back or V.Source - Front.                                                                                                      |
| Audio Channel      | dropdown            | Selects the corresponding audio channel from your Dante Controller that you would like to route a virtual source. If desired, the same audio channel can be routed to multiple beams at the same time. |
| Performance Target | slider              | Adjusts the trade-off between sound level output and dispersion uniformity.                                                                                                                            |

You can adjust the directivity parameters from the right side of the Properties Panel. Use the Position selector to change the method to calculate the Virtual Source's origin point:

| Parameter | Type of Interaction | Function                                                                                                                                                                                                        |
| --------- | ------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Global    | field               | Cartesian X,Y,Z coordinates based on the Scene’s origin point                                                                                                                                                   |
| Local     | field               | Cartesian X,Y,Z coordinates based on the array’s origin point (center of plane along the grill side)                                                                                                            |
| Angles    | field               | Steering Angles - horizontal (H) and vertical (V) angles to create a vector based on the array’s origin point Focal Distance - a radial distance from the array’s origin point along the Steering Angles vector |

A Virtual Source’s location is fixed to the global cartesian coordinate. When you move an array after positioning a Virtual Source, the origin point of the Virtual Source stays locked in place relative to the array.

Beneath the adjustable parameters, you will see details of the array and preset layers the beam is used in.


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