人力ボーカロイド  Tag

Jinriki Vocaloid (人力ボーカロイド, lit. "Manual Vocaloid") is a common practice in Nico Nico Douga targeting Vocaloids, and involves re-editing an existing singing voice (especially a singer or anime character), extracting tones as WAV files and reassembling them. It is different from the popular singing synthesizer Vocaloid, made from YAMAHA. -niconicodouga.fandom.com

While many of these videos do not use existing vocal engines, a subtype called UTAU-shiki Jinriki (UTAU式人力, lit. "UTAU-Type Manual") involves the creation and usage of private UTAU voicebanks.