I have my folders named by encode type (MP3,WMA etc....) as I hate traversing folders by artist, album etc...and this way I know which old encodes I need to re-do at some point when I have time as having over a TB of music makes traversing folders a big pain in the rear as my collection spans from the late 90s.
I ensure every file has the correct metadata (album, artist bitrate etc...) and let the music program sort it out. Never had an issue and catalogs 100% every time.
I did find an odd but welcome surprise the other day in that my 2015 Silverado LTZ recognized my 512GB SSD drive. I like that they support NTFS on the new systems and not just FAT32.
I know everyone does it different but back to the original question, I don't think it is possible to disable the audible warning. I just push the voice button again and it will beep for a command.