The plugin could be named "audio copy-paster" or "snippet looper", but I choose to call it InstantSampler because it does what a simple 'normal' sampler does (playing audio fragments by MIDI notes), but it takes its samples (instantly) from the audio input whenever you hit a specific MIDI note for the first time. Every consecutive time you hit the same MIDI-note, it plays back the recorded fragment (or shorter, depending on the note's length).