A-127 VC Triple Resonance Filter

Doepfer A-127

Module A-127 is a triple resonance filter for eurorack modular synthesizer systems. Each filter features a dedicated triangle wave LFO and corresponding LED display in tandem with adjustable frequency and amplitude. The LFO can be disengaged by patching an external control voltage into the corresponding input; this configuration routes the amplitude control of the internal LFO into the external CV input.

Each filter section features controls for LFO frequency, LFO/ext CV amplitude, filter resonance, filter frequency, and filter amplitude. There are also dedicated outputs for each filter as well as a mix output. Every filter section is fed by a single input with corresponding attenuator. Driving the input particularly hard can result in lovely distortion that is ideal for the creation of unique sounds.

A-127 Features

• Triple resonance filter
• Triangle wave LFO for each filter section
• CV inputs for each filter section
• Separate outputs for each filter section
• Mix output for summed signal