Below The Belt

Below the Belt is a parametric kick drum synthesizer that generates sub-bass weight and transient punch using an exponential pitch sweep. Inspired by BazzISM and Kick 2, its core engine glides from a customizable start frequency down to a fundamental end frequency. Users can precisely shape the pitch drop, body hold, and amplitude decay, while a built-in noise generator injects a high-passed click for initial attack bite. Both amplitude and pitch envelopes are fully customizable across a 20 Hz to 12,000 Hz logarithmic scale. 

 The plugin's audio processing chain adds harmonic complexity without sacrificing low-end power. A post-oscillator distortion module offers six saturation algorithms—including tube emulation and bitcrushing—that fully bypass at zero drive to keep presets clean. The signal then routes through a DC blocker, an exponential low-pass tone filter, and a flexible two-band biquad parametric EQ for tonal shaping. Finally, a smooth soft-clip output ceiling starting at -1 dBFS prevents digital clipping while preserving essential transient impact. 

 Beyond synthesis, the plugin features a hybrid sampling architecture where users can import custom kick samples. An automated pitch detector identifies the sample's fundamental frequency, seamlessly aligning a secondary sine sub-oscillator underneath to reinforce missing low-end weight. A separate top-layer engine blends transient clicks post-distortion to keep high-frequency attacks pristine. The engine provides robust voice management with both polyphonic and monophonic modes, utilizing a fast-fade voice stealing algorithm to prevent audio pops during rapid MIDI re-triggers.