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WebControl RPI 3B GPIO

I have hooked up 3 buttons and 1 LED to my raspberry pi.

The buttons each have one side to GPIO pin and one side to ground (Pullups?)
The LED has the anode to GPIO and the cathode to ground. (Active high?)

What are the gpio pins set at for the play/pause/stop function and what is the difference in the LED between each of the options?