The sixth album from the microtonal tuba trio of Robin Hayward, Peder Simonsen, and Martin Taxt, exploring the acoustic phenomena of half-valve combinations in two richly harmonic compositions developed during an artist residency in Andersabo, Sweden and recorded in Oslo, creating uniquely resonant and surprisingly consonant spectra shaped by each instrument's signature tuning.

A live concert at Dom Cultural Center in Moscow, Russia in 2015 from Norwegian tuba player Martin Taxt, Saint Petersburg violinist and object player Andrey Popovskiy, and ppool performer Kurt Liedwart focusing on sinewaves and noise, in an extended lowercase improvisation exploring harmonic and microtonal sounds.