HOW TO MAKE AN UNDERTALE VOICE: 1. Get a clip of someone saying "Maybe" (make sure the audio is clear) 2. Crop the audio so it's just the "ay" in "maybe" 3. Do a fade at the end and a smaller fade at the beginning 4. Test it out by adding it to toopgobos text engine in the text sounds and changing the voice values to the number of your voice 5. Done 4.
Undertale voices created using a voice cloning text to speech website and the steps used to make Sans voice out of that one Patrick line