The tunes work but must be mp3 files in a directory called MP3 on the microSD card. If you have music playing the spoken directions will indeed override the music.

Basecamp has a steep learning curve to be sure. Once you learn it, it does work. The ALT key is your friend.

Sorry it did not work out for you. I cannot use a cell phone for navigation as the text is just too small to read and I have lost several high end phones out of handlebar grips.