Zplane Vielklang Instant Harmon v2.x WiN | 19 MbVielklang Instant Harmony generates harmonies with 2-4 voices.

It is packed with musical intelligence and music theory: it detects the best fitting harmonies for each individual input melody, and automatically synthesizes up to four voices with the voices not merely running in parallel but with their voicings selected to sound most natural (voice leading).