Can I Change the Voltage Range of the Analog Inputs?

All Saleae devices with analog inputs have fixed analog voltage range. They do not support a hardware analog zoom like oscilloscopes do. For more information about the differences between the Saleae products and oscilloscopes, see this article:

Can These Products Replace an Oscilloscope?

For more information about the analog resolution of the Saleae products, see this article:

Resolution of the Analog Inputs