That is beyond the scope of normal audio editing. AI explains...
"WavePad can edit and process audio, and its manual shows features like Voice Change, Text To Speech, and Reduce Vocals, but it does not document a built-in feature that translates an uploaded singer’s performance into another language while preserving the singer’s original voice. WavePad does have an AI Revoice/Translate feature in NCH’s video software, but that page is for video voice tracks, not WavePad music tracks.
What this means
Your idea is technically in the realm of modern AI audio, but it is a much more advanced task than ordinary audio editing. It usually requires three separate capabilities: speech-to-text, translation, and voice cloning or voice conversion. WavePad’s documented tools cover editing and some voice effects, but not that full pipeline for songs.
Practical limits
Songs are harder than spoken narration because they include melody, background instruments, reverb, harmony, and timing constraints. Preserving the original singer’s voice while changing the language also raises quality and rights issues, especially if you are working with a real artist’s recording. WavePad’s manual only confirms conventional audio editing and voice effects, not AI singing translation.
Best path
If you want to pursue this idea, it sounds more like a feature request for NCH than something WavePad already does. A realistic first version would be translation of spoken vocals or narration, not full singing, because that is far easier to implement and control."