Doubler has been played on NTS shows including Brav, with Alter-Vu first played on 19 February 2017.

Doubler is the collaborative project of Jason Letkiewicz and Mike Petillo.

Lines of Force is the first full-length release from the duo, following an EP on Confused House last year. The press release says that the album is a "continuation of methods" from that first record, "exploring natural yet mysterious overlaps between studio, environment and performer."