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 PA4 Dual Spring Reverb by Physical Audio Ltd. is a Virtual Effect Audio Plugin. It functions as an Audio Units Plugin.
PA4 Dual Spring Reverb
Product PA4 Dual Spring Reverb
Developer Physical Audio Ltd.
Price (MSRP)
Type / Tags Reverbs
Plug-in, App & Soundware Format(s)
Operating System Availability
Download Released
Downloads Released
System Requirements
Miscellaneous Information
Copy ProtectionSerial Number
Max. 6 items
Latest Version Changes [view all]

PA4 is the first plug-in to model wave propagation in helical springs.
The audio engine is built entirely upon the simulation of the inherent physical equations, without any approximations.
This gives innovative control over the springs, with fully-customisable parameters.
The modelling starts from a mathematical description of wave propagation in elastic helical structures.
The physical properties such as length, wire radius, and pitch angle are then mapped to the perceptual parameters.
From there, a discrete modal system is created with up to 4,000 modes for each spring.

Main Features.

Adjustable spring setup using
- Echo Time
- Echo Spread
- Chirp Cutoff
- Boing.

Multi-band frequency dependent Decays
- Low, mid, and high Chirp modes
- Shimmer modes.

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