All videos are now exported to at -14 LUFS. Above this YouTube will process the audio and reduce the volume to this standard for streaming. However anything lower wont necessarily get lifted so from time to time I may make a mistake when i export and forget to lift or normalise audio on a specific channel. In these cases I usually catch it early and re-upload the video.

The only other question is whether the should be any music at all in a tutorial. In some cases I've been told it helps. In others it distracts. Share you thought here.