Dear Anne
Most of the punchcards that come with the colour changer are ready for Fair Isle. I find it’s useful to remember that if you think you might want to use an ordinary Fair Isle card with the colour changer, it saves a lot of hassle if you punch another card in reverse. If you want to use a reversed card for normal Fair Isle, you need to swap the main and contrast yarns over in the ordinary sinker plate. I’m a punchcard knitter but yes, I do know that on electronic machines you just have to use the colour reverse lever to make a Fair Isle pattern suitable for using with the colour changer. Best wishes, Lisa