Let’s use VocalRemover.org as the example:
Do not trust random .exe downloads from shady forums. The best FNF vocal removers are browser-based or open-source. Here are the three best links currently available: fnf vocal remover link
If you used the links above but the results still sound bad, check these three issues: Let’s use VocalRemover
Issue 1: The song is heavily compressed. (Common in FNF ports). Issue 2: The vocals are whisper-quiet
Issue 2: The vocals are whisper-quiet.
Issue 3: You hear "ghost robots" or "digital chirping."