Nebula combines delay and reverb. With low Density you hear clear echoes; with high Density they turn into a thick cloud. Feedback up to 100% gives spaces that never fade, and Shimmer lifts the tail by an octave or a fifth — angelic pads from a single chord. Six modes (Gemini, Comet, Void, Pulsar, Aurora, Drift), tempo sync and ducking under the vocal.