Adding the Tetra2Go to Xlights

Until the xLights team updates their software to include the Tetra2Go, you will need to modify it manually to add your controller.

Using a text editor, like Notepad++
(https://github.com/notepad-plus-plus/notepad-plus-plus/releases/download/v8.6.4/npp.8.6.4.Installer.x64.exe)

open C:\Program Files\xLights\controllers\wled.xcontroller

At the end of the file, you will find the entry for the Duo2Go.
Immediately after the last "</Controller> line and before the last "</Vendor> line, add the following:

<Controller Name="RGB2Go-Tetra2Go">
        <Variant Name="Base" Base="WLED:BaseWLEDSettings">
            <MaxPixelPort>4</MaxPixelPort>
            <MaxSerialPort>0</MaxSerialPort>
            <Port1>2</Port1>
            <Port2>13</Port2>
	    <Port3>12</Port3>
	    <Port4>14</Port4>
        </Variant>
	<Variant Name="w/ Differential Module" Base="WLED:BaseWLEDSettings">
            <MaxPixelPort>8</MaxPixelPort>
            <MaxSerialPort>0</MaxSerialPort>
            <Port1>2</Port1>
            <Port2>13</Port2>
	    <Port3>12</Port3>
	    <Port4>14</Port4>
	    <Port5>27</Port5>
            <Port6>26</Port6>
            <Port7>25</Port7>
            <Port8>33</Port8>
        </Variant>
</Controller>

When you are finished, the end of file should look like this:

Then - start up xLights!
When you add your controller in Xlights under the "Controllers" tab, select "WLED" as the Vendor and you will see the Tetra as an available  Model.