Using purely acoustic means, Subroutine create an ethereal subterranean world often reminiscent of electroacoustic music. Surprisingly similar sounds are yielded from the two bass instruments, and it is often difficult to locate which sound is coming from which sound source. Since 2021 the inclusion of microtonal vibraphone further deepens the connections between the instruments.
Morten J. Olsen - rotating bass drum, microtonal vibraphone
Robin Hayward - microtonal tuba