[Climax] Drums: driving beat Siku/Quena: frantic phrases Synth: turbulent, distorted
I think you might be referring to a musical term. "Etas," "Inca," and "Crack" seem to be unrelated words, but I'm assuming you might be thinking of a composition or a piece of music. etas-inca-crack
If I were to notate this piece, it might look like this: it might look like this: