8 Density

[NegaNova]

I believe the densities are used with the analogy of music. The first note of sound in the next octave is not the same note that was in the previous octave, they both are an A (for example), but one is a higher tone, and thus a different note, but they have similarities. So maybe it's like... the third density of the next octave will have familiarities with this one, but in the next octave it will be a much higher frequency, which sounds kind of cool. Blast offff let's go!