Adamsynths Multimode VCF VCA

4-pole multimode VCF/VCA filter with overdrive for the Warthog system

• Multimode VCF and VCA combined in a single module, with built-in mixer and overdrive
• Four filter modes: 4-pole low-pass, 2-pole low-pass, 2-pole band-pass, and 2-pole high-pass
• Switchable and adjustable Q compensation in low-pass modes
• V/OCT input with switchable tracking: OFF, ½, and FULL
• Three frequency modulation inputs with dedicated control, one with selectable source
• Controllable RESO CV input for resonance modulation
• Three-input audio mixer with LED-indicated saturation
• Separate VCF and VCA outputs with dedicated inputs, outputs, and CV

The Adamsynths Multimode VCF VCA is the filter module of the Warthog system: a modern and versatile multimode VCF, paired with a VCA and an input mixer with overdrive. In a single module, you’ll find the entire signal chain needed to shape the sound of your oscillators—from mixing sources to filtering to dynamic amplitude control—with a wide range of modulation paths for ever-changing patches.

Four filter modes for the Adamsynths multimodal VCF

The filter offers four selectable responses: 4-pole low-pass, 2-pole low-pass, 2-pole band-pass, and 2-pole high-pass. The 4-pole mode delivers a sharp, full-bodied cut for basses and leads; the 2-pole low-pass is softer and more open; while the band-pass and high-pass modes let you isolate portions of the spectrum, lighten up pads, and create nasal or percussive timbres.

Adjustable Q compensation in low-pass filters

In low-pass modes, Q compensation isn’t just enabled—it’s also adjustable: you can decide how much of the low frequencies to restore as you increase the resonance. This way, you can maintain the body of the sound even at high resonances, or let the filter thin out for a more classic character, depending on what the patch calls for.

Frequency and Resonance Modulation for an Expressive Analog Filter

To control the cutoff frequency, there is a V/OCT input with tracking that can be switched between OFF, ½, and FULL—useful for making the filter follow the keyboard or for using it in self-oscillation as a pitched source. In addition, there are three frequency modulation inputs, each with its own intensity control.

FCV1, FCV2, and FCV3: three modulation paths

FCV1 directly modulates the filter. FCV2 has a selectable source: it can be its dedicated input, the audio signal before the VCF (taken from the mixer), or the audio signal after the VCF. The two audio options open the door to audio-rate modulations and self-modulation behaviors, ideal for gritty timbres and complex textures. FCV3 also directly modulates the filter, but can be switched so that the incoming ENV signal controls the VCA after the filter.

RESO CV for Dynamic Resonance

A RESO CV input with dedicated control allows you to modulate resonance with LFOs, envelopes, or sequencers, adding animation and dynamic accents to the filtered sound.

Three-input mixer with overdrive and integrated VCA

The VCF features three audio inputs with adjustable levels, mixed in a mixer stage before the filter. By pushing the levels, you can saturate this stage, with an LED indicating overdrive: the resulting saturation is inherent to the mixer’s design itself, adding warmth, density, and grit to the signal before it reaches the filter.

Separate outputs and a VCA with dedicated CV

The module offers a separate output for the VCF and a VCA with its own input and output, which you can use after the filter or independently on other sources in your system. The VCA also has a dedicated CV input, in addition to the ability to be controlled by the ENV signal via FCV3.

Hidden parameters and Warthog filter resonance calibration

A dedicated menu contains the resonance calibration parameters for each filter mode: resonance level for 4-pole low-pass, 2-pole low-pass, 2-pole band-pass, and 2-pole high-pass. This allows you to balance the behavior of the four filter responses and tailor them to the rest of your Warthog system.

Technical Specifications

• Brand: Adamsynths
• Model: Multimode VCF VCA
• System: Warthog
• Type: Multimode VCF and VCA with built-in mixer and overdrive
• Filter modes: 4-pole low-pass (4PLP), 2-pole low-pass (2PLP), 2-pole band-pass (2PBP), 2-pole high-pass (2PHP)
• Q compensation: switchable and adjustable in low-pass modes
• V/OCT Input: Tracking switchable to OFF, ½, FULL
• Frequency modulation inputs: FCV1, FCV2, FCV3 with individual controls
• FCV2 source: FCV2 input, pre-VCF audio from the mixer, or post-VCF audio
• FCV3: filter modulation or, alternatively, ENV input for controlling the post-filter VCA
• RESO CV input: with dedicated control
• VCF audio inputs: 3, with adjustable level
• Overdrive: saturatable pre-filter mixer stage, with LED indicator
• Outputs: Separate VCF, VCA in and out
• VCA: Dedicated CV input
• Hidden parameters: resonance level for 4PLP, 2PLP, 2PBP, 2PHP