VPT's SoundTrigger app maps left/right audio channels to VPT controllers for audio-reactive visuals

Alongside the Video Trigger, VPT offers a companion SoundTrigger app that uses sound input to control VPT parameters over OSC, using a router just like VPT’s. Here the controller numbers are the left and right channels of a stereo input, so incoming audio level on each channel drives whatever parameters those controllers are mapped to in the router. Each channel can be shaped with amplification, smoothing and a threshold to tune sensitivity and reject noise. This is the audio-reactive hook for a VPT rig — a way to make the sound of a set modulate the projected visuals without manual control.

Examples

Turn on the microphone in SoundTrigger, set a threshold and smoothing on the left channel, and map that controller in VPT’s router to a layer’s fade so louder audio brightens the projection.

Assessment

What do the controller numbers represent in VPT’s SoundTrigger, and which three per-channel controls tune its response? Give one audio-reactive mapping it enables.