Plugins are the extra sauce for utility and instrument modules.
Zyphr is meant to be basic out-of-the-box especially for sound synthesis. Plugins are where Zyphr can acquire more taste. For example, the minimal synth module can be extended by adding arpeggiator plugin which consists of a handful of algorithms to generate interesting repetitive sounds. Upcoming plugins include b-meter, equaliser, compressor, arpeggiator, automator, arranger, reducer, notes, and sound presets for instrument modules.