Pumpit
Volume Ducker
"Precision volume ducking with 10 curve shapes, three trigger modes, and a custom hand-drawn spline editor — from subtle groove pumping to aggressive sidechain crush."
Get that pumping groove on any track. Pumpit is a tempo-synced sidechain ducker that shapes your signal with a volume-ducking envelope — sync it to tempo, trigger it from a sidechain input or MIDI notes, or draw the curve by hand. Ten curve shapes plus a custom spline editor and a Linkwitz-Riley multiband split give you everything from subtle movement to hard four-on-the-floor pumping. Free, signed and notarized for macOS as AU, VST3, and Standalone.
AU
VST3
Standalone
macOS
FEATURES
Ducking Engine
◆10 curve shapes: Smooth, Punchy, Hard, Slow, Long Tail, Half Sine, Log, Exponential, Linear, and a hand-drawn Custom curve with Catmull-Rom spline interpolation
◆Amount (0–100%), Hold (0–50%), and Offset (−50% to +50%) controls, plus tempo-synced Rate at 1/1, 1/2, 1/4, or 1/8
◆Stereo Offset (0–20ms) shifts the left/right ducking timing for a wider stereo feel
◆5ms lookahead with plug-in delay compensation reported to your DAW, so ducking stays aligned to the beat
Three Trigger Modes
◆Auto — tempo-synced free-running envelope at 1/1, 1/2, 1/4, or 1/8 divisions
◆Sidechain — trigger from an external input with an HP filter (20–500 Hz) so low end doesn't over-trigger, plus Retrigger and SC Listen audition
◆MIDI — note-on triggers filtered to a specific note or Any
Multiband & Output
◆4th-order Linkwitz-Riley multiband ducking — duck only the low band, pass highs through unprocessed
◆Auto-gain compensation via 128-point numerical integration of the curve integral
◆Soft clipper output stage (tanh knee at 0.9) + dry/wet mix for parallel processing
◆Sidechain listen (SC) toggle — audition what the detector is hearing
Monitoring & Workflow
◆Real-time curve display with waveform ghost overlay, phase position indicator, and 4×8 grid
◆Input, Gain Reduction, and Output level meters at 30 Hz with thread-safe atomics
◆A/B comparison, Randomize, and preset save/load
◆11 factory presets tuned for tech house and club production
FACTORY PRESETS
Init
Subtle PumpIt
Tech House Standard
Deep House Groove
Aggressive PumpIt
Bass Only Duck
Half Time
Eighth Note Chop
Long Tail PumpIt
Pad Ducker
Remi Blaze PumpIt
SYSTEM REQUIREMENTS
- OS macOS 15.0 (Sequoia) or later
- Architecture Apple Silicon + Intel (Universal Binary)
- Formats AU, VST3, Standalone
- DAW Any AU or VST3 compatible host
- Access Free — no account required
DOWNLOAD FREE
Pumpit is free — no account, no wallet, no strings. Download the installer and drop it in your DAW.