PA3 Derailer

PA3 Derailer

Build new instruments

Derailer is a physical modelling system with two basic elements. One is a metal bar that you can strike or bow. The other is a nonlinear spring connection. This allows you to join two bars together so that vibrations from one create sympathetic resonance in the other. By connecting multiple bars you can create new instruments that have their own unique sound.

There are 37 strike bars, 5 resonators, and up to 81 connections to play with. The adjustable physical parameters and nonlinearity of the connections produce a wide range of tonal variation that reacts to striking velocity or bowing pressure. Derailer uses finite-difference time-domain numerical modelling.

Example presets





Derailer + ROLI Seaboard


Multi-strike percussion

In-depth Tutorial

PA3 Derailer will be released 30th March