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 PA3 Derailer by Physical Audio is a Virtual Instrument Audio Plugin. It functions as an Audio Units Plugin.
PA3 Derailer
Product PA3 Derailer
Developer Physical Audio
Price (MSRP)
Type / Tags Synth (Physical Modeling)Modular
Plug-in, App & Soundware Format(s)
Operating System Availability
Download Released
Downloads Released
System Requirements
macOS 10.9

PA3 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 mass/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.


  • 37 strike bars.
  • 5 resonators bars.
  • Up to 81 mass/spring connections.
  • Striking, multi-strike arpeggiator and bowing gestures.
  • Derailer is an Audio Unit Instrument plug-in for macOS 10.9 or above.
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