How to implement multiple LED modes in a sketch with potentiometers?
Since you already know how to hook up a pot and read it's value, it's quite simple. You already have it hooked up in a voltage divider configuration and are getting a 10 bit (0-1023) value using analogRead(), you just need to decide what to do with it.

Assume potVal has the value of the pot.;

if (potVal &lt; 256) {
    // Pot is one quarter turn or less
} else if (potVal &lt; 512) {
    // Pot is between 256 and 512, so its more than quarter but less than half
} else if (potVal &lt; 768) {
    // Pot is between half and 3/4ths of the way there
} else {
    // Pot is greater than 3/4 of it's full range
}


So I have broken it down into four quadrants for you, but you can do it however you like.