On Tap is Carbonated Audio's sidechain ducking plugin. It gives you a classic pump without routing a kick to a compressor: you insert it on a track and pick a shape. The core is a library of 16 hand-crafted ducking curves, including a standard sidechain pump, a dedicated sub-bass duck and a reverse chain, with a slope offset, a shift amount and a draggable end marker to tune the result. Three trigger modes drive it, Sync to DAW tempo, MIDI from any note, and Audio from an incoming signal.
The band-split crossover, from 20 Hz to 5.12 kHz, lets you duck only above or below a frequency, so you can pump the sub out of a kick's way while leaving the top untouched. Anti-click smoothing cleans the gain transitions, and the developer reports zero latency with no lookahead. It is $20, one time, for three machines, with formats VST3, AU and AAX on macOS and VST3 on Windows. The nearest rivals are Kickstart 2, Cableguys VolumeShaper 6 and the ShaperBox 3 bundle, and On Tap undercuts them all. For the same studio's ducking reverb, see FOAM. Full walkthrough in the On Tap first look.