https://store.cherryaudio.com/modules/h ... harmoniser
The initial input cv can come from a MIDI keyboard, DAW or VM internal sequencer and the harmony intervals can be manually controlled or cv modulated which offers the potential for enormous variety. Also, the chord behind the input melody does not need to change with every input note but can do so after a fixed or random number of melody notes.
The YouTube video linked below gives some indication of the potential available even to someone like me who is clearly not a talented keyboard player. My apologies to all of the talented keyboard players out there who don't need this module.
https://www.youtube.com/watch?v=Le6uPj0V_yA