Killer envelope. Out of production. Aren’t many of these around.
The Chunk Systems Agent 00Funk (and its updated Mark II version) is a hand-built, all-analog envelope filter and auto-wah effect pedal originally manufactured in Sydney, Australia.
Key Features
• Analog Circuitry: Uses a 2-pole low-pass filter with a logarithmic sweep for deep, wet, synth-like tones.
• Versatile Controls: Features knobs for Pitch (base filter frequency), Smoothness (sweep response speed), Sweep (filter width/dynamics), and Squelch (resonance/gain), plus a switch for up/down sweep direction.
• Synth Integration: Includes an envelope/CV jack designed to sync or chain with the Chunk Systems Brown Dog Gated Bass Fuzz for aggressive synthesizer sounds.
• Power Options: Runs on a single 9V battery (with a tool-free pull-out magazine) or an external 9V–24V DC power supply.
Usability & Tone
• Sound Profile: Known for being fat, squelchy, and deeply resonant—often compared to vintage synth filters or units like the Mu-Tron Q-Tron.
• Quirks: Users on forums like TalkBass note that it can be "touchy" or finicky to dial in depending on your instrument's output and playing dynamics.