I have two controllers: a Sprite with 6 zones and a Pixie faucet controller.  I would like to use Google to start and stop watering on the Pixie faucet controller.  The User Guide FAQ says:

"3. What if I have multiple controllers?

Unfortunately, Google Assistant doesn't support multiple devices. The NetroHome action controls your first Netro controller. If you have multiple Netro irrigation controllers, please try with Google Home."

How do I control the PIxie in the Google Home app?