The architecture applies a friction algorithm to a 2nd order mass-spring, modeling the reactivity of surfaces in contact. Two waveguides are used to model the primary resonances of a physical object. The synthesis engine employs 4x oversampling, providing reasonable emulations of sounds produced by friction, such as squealing tires, squeaky hinges and wiping noises.

Modulation consists of three 32-stage envelopes (designed by Chris Kerry,) 4 configurable LFOs and an x-y pad. A group of sends allows modulators and controllers to be assigned to multiple destinations, similar to those used on xoxos' other physical models such as Fauna and Oscine Tract.

Populus generates MIDI sequences using an algorithm modeled on biological behaviour. The measure is treated as a 'year' and note events are determined by parameters describing the 'life cycle' of each note.

The sequences are usually patterned, yet rarely repeat exactly, creating motif-like qualities.

Populus was created for Computer Music Magazine and is included with all xoxos VST license purchases.

Visit: xoxos