Vamp

8HP Multi-Mode LP/BP/HP Sallen-Key Filter with Tube Saturation & Distortion

VAMP is a multi-mode analogue filter that gives you low-pass, band-pass, and high-pass responses in a compact 8HP design. At its heart lies a classic Sallen-Key topology supercharged with real vacuum tube (12AU7) saturation and multiple stages of clipping, letting you move seamlessly from smooth, hi-fi filtering to snarling, overdriven character.

One half of the tube is used to saturate the input, while the other half provide MS-20-inspired resonance limiting (tube, not diodes). With FLOW placing the VCA pre-tube or post-filter, and FANGS selecting Off / Soft / Hard output clipping, VAMP ranges from subtle warmth to ferocious harmonic destruction.

Features
• Three filter modes: low-pass, band-pass, and high-pass
• Classic Sallen-Key topology with tube saturation and clipping
• 12AU7 vacuum tube: one half for input drive, one half for resonance distortion
• MS-20-style resonance limiting/clipping for aggressive tones
• FLOW switch: Integrated VCA pre-tube or post-filter
• FANGS: output clipping: off / soft clipping / hard clipping
• 1V/Oct cutoff tracking: use VAMP as a VCO in self-oscillation
• Extensive CV control: GAIN, FREAK (cutoff), REZ (resonance) (all with attenuverters)
• Self-oscillation for screaming tones

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https://www.apolloviewmodular.com/modules/vamp