In the residency series Extratool, Extrapool hands over its sound studio to a musician or (sound) artist for a few days. This person then invites a colleague to collaborate on two new compositions. At the center of this series is Yuri Landman's range of instruments: string and percussion instruments on which coloured dots indicate harmonic divisions that deepen the various sounds. From the 3rd till the 6th of December 2020 Albert van Abbe worked on this second iteration. He invited Swedish artist David von Bahr to collaborate. Covid regulations created a situation in which the residency took place simultaneously in Nijmegen, Stockholm and Eindhoven.