Portal by Output is a granular synthesis audio-effect plugin for re-synthesizing audio into textured grains.
Portal by Output is a granular synthesis engine, framed by Output as a granular engine made musical. It takes incoming audio and re-synthesizes it through granular techniques, breaking sound into small grains and re-layering and transforming those grains to produce new textures, sweeps, and harmonically rich output from any input source.
Independent roundups of granular effects describe Portal as loading audio into memory before granular processing while retaining the character of the original sound, and note that its signal path includes a time-stretch engine placed ahead of the main grain engine together with a grain delay. These characteristics place Portal in the same cloud-style granular-engine category as other granular effect plugins used for creative sound design.