Hello, Diego.
If you are using the Pololu USB Software Development Kit, the method you should look at is getVariables. There are several overloaded functions of getVariables each having entirely different definitions. Since we do not have a Visual Basic example using any of those methods, I recommend looking at the pololu-usb-sdk/Maestro/Usc/Usc.cs file and reading the descriptions for each getVariables function to figure out which is appropriate for your application. You should be able to find the Usc folder containing that file after downloading the Pololu USB SDK for the Maestro.
Also, one of our forum members posted their working Visual Basic .NET script for the Maestro using one of the getVariables functions, which could be helpful to you.
- Amanda