Kris Sujata, who records as Valiska, got his hands on a Bontempi organ, and put it to drone use. The organ is distinguished by its sound-production process, which involves air being played through reeds. Valiska’s take on it is deeply tonal. The occasional modulations serve less as melodic formulations than as shifts intended to focus the ear on what has preceded and what will succeed. It is like shifting from plateau to plateau and getting a new sense of the vista with each change in elevation. Texturally, this is a maximalist sound, dense with overtones, and downright rivetting.