David Donohoe and David Lacey have previously collaborated as part of Dublin-based improvisation project Rainfear. The minimal arrangements of dissonant electronics, understated percussion and sparse piano chords of Noctules recall their work in other contexts, but here, extensive editing and processing are an essential part of the aesthetic. These recordings also utilise DAXA, a translator/catalyst for the Yamaha DX7, designed and implemented by Dennis McNulty in collaboration with Donohoe.