Lemonstrum 3 is an Acoustic Guitar Strummer plug-in - it acts as a chord sample player. Each of the 12 keys on the keyboard (A-G#) triggers the chord you assign to it. You can load up to three samples: different strokes of the same chord for each trigger, which Lemonstrum will then play alternately whenever you press the key. A light press will play a scratch effect.
It is pre-loaded with power chords or "fifths," which blend well with both major and minor chords. You can also mic your own guitar and record 3 down-strokes of the chord that you want and load them into Lemonstrum 3.