Can a Rocktron Banshee talkbox work on Casio CTK-571 keyboard?

No, the Rocktron Banshee talkbox is not designed to work with a Casio CTK-571 keyboard. The Rocktron Banshee talkbox is specifically designed to work with electric guitars, and it requires a guitar amplifier to produce sound. The Casio CTK-571 keyboard is an electronic keyboard that does not have a guitar amplifier, so it cannot be used to power the Rocktron Banshee talkbox.