AM317 Dual VC Filter

This is recreation of the PPG 317 dual voltage controlled filter fom 1976, used by Klaus Schulze, Chris Franke and many others. The design has been reverse enginereed from photographs of the original PCB's.

It is a pair of traditional Mini Moog style ladder filters which can be used as seperate low and high pass filters or combined to create band pass and band reject modes. The module is designed to complement the Behringer System 55 Modular System, with a 14HP panel width and the absence of audio signal attenuators.

The AM317 delivers a range of creative sounds from the two Mini-Moog style filters with resonance in the low pass filter and a clarity of audio when in self oscillation. 

Euro Rack Module: 14HP wide
User Manual:   Download PDF

There are ten 3.5 mm jack sockets on the base of the front panel:

• 2x audio input
• 2x audio output
• 6x frequency control CV inputs

PRODUCT STATUS: IN DEVELOPMENT