Umfang has been a regular guest, first appearing on 9 September 2016 and most recently on 24 January 2020. Umfang has been played over 70 times on NTS, first on 7 July 2015. Umfang's music has been featured on 72 episodes.

Umfang is Emma Olson, a Brooklyn-based techno DJ who co-founded the New York-based Discwoman collective. The Bronx-born producer just dropped her debut full-length, Symbolic Use of Light, via Ninja Tune imprint Technicolour. Olson has crafted an explorative style of production that's perched on the cusp of dance floor mechanics. With influences spanning from Motown to German minimalism, Olson embraces the sparse and ambient sensibilities hidden beneath the hard surface of techno for a thoughtful body of work that is uniquely her own.