Tip! Originally written to accompany Catarina Miranda’s ambitious Boca Muralha dance piece, a duet inspired by ancient Greek deities of vengeance the Furies, this tightly-coiled experiment comes off like Steve Reich in a k-hole. Saldanha makes use of a delay to manipulate and control the two voices, freezing fragments and curving them into slippery vortexes. Raw syllables are repeated, intersected and phased from staccato passages into operatic, rhythmic choruses, time-stretching snowballed clus…