@Mazz; Right-click on one of your buttons. Go to "Set Selector," and navigate to the set you want it to switch to when you hold down the button. Select "While Held." That'll get you to 2 layouts easily enough. If you want 3 layouts, it gets a little tricky. You do the same thing you did for getting the second layout (just bind another button on your 1st set to use Set 3 while held). However, if you ever hit both modifier buttons at the same time, your layouts will bug out.
To fix this, go to layout 2 and 3. On the other modifier key (the one that's empty right now), add a modifier so that it goes back to the 1st set (One Way). This way, if you ever get stuck in layout 2 or 3, just press both modifier keys one at a time. It'll take you back to the 1st layout.
I highly recommend staying with just layouts 1 and 2 if you can. Adding that 3rd layout can be a little buggy.
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