You are right ... But to Delete a Profile is quite simple, just select it e press "Delete" from Profile Window.
I've tested Path with spaces, no problems for me, it work correctly ...

Because only few models of Nuvis manage mp3 audio, and those manage .wav as well, i decided to not consider mp3 vocal advices, but only .wav.
You have to convert your mp3 into wave Audio to make it work ...

Adding mp3 is not a complicated matter, if others require this option i can add it ...
Bye, Bye