Note Kit Keyboard:
Note Kit keyboards allow you to play a single sound chromatically, whereas Sample Kit keyboards include a different sound on each key. Sources may span up to 88 keys, instead of just the 15 Sample Voices from a Sample Kit.
Since the black keys now represent notes on the keyboard such as C# or G#, Modifiers are absent from Note kits. Black Dots on the keyboard now represent available notes for the currently loaded source. As you can see in the screenshot above, the currently loaded source does not span the entire keyboard. Available White Keys are highlighted by a darker ring than those out of range.
For more information on Arcade's Note Engine, see our guide here.