LEDs are like lasers, they work on the same principle and both only put out one frequency of light, called coherent light. every LED has a different turn on voltage. you put a series resistor on them to set the current, more current means brighter. all the series resistors are gonna be the same (they could be tuned but that would add cost to the Push) but the turn on voltages will be slightly different, therefore they'll be different brightness levels. that might be perceived as different colors but each red LED puts out the SAME red, same for the other colors. a tri color LED is 3 LEDs in one package. white LEDs are an arbitrary color with a phosphor coating or something of the like that glows when exposed to some color.
you could open Push and use an ammeter and potentiometer to tune the current for every LED, many hours of work.
I agree with all of this. I'm just bored of writing "its music, just listen and trust your judgement"