Cumulonimbus is a granular delay effect which works by emitting short (10ms - 1s) segments, called “grains”, from a chosen position in a recording buffer when triggered. The position offset, replay speed and length of the grains are controllable, as is the shape of the amplitude envelope applied to them, and up to 64 grains may be playing at any one time. This enables a range of effects from pitch-shifting and texture generation to diffused and glitchy delays.

The recording buffer can be frozen, either manually or via a gate signal, enabling the audio captured in the current buffer to be used as a static source for granular audio generation.

A feedback circuit is included, with controllable feedback amount. Both the contents of the recording buffer and the positions of active grains are shown in a helpful visual display.