... the video shows that you can
record in mp3 format, it does not mention recording
over an mp3 ... the question is: "if there is an mp3 file in the 'Player' will the Pa900 allow that mp3 to play while vocals and additional instrumentals are being played", and I do not think the Pa900 has that functionality... what happens is, after loading an mp3 into the 'Player', and then pressing the right buttons to record in mp3 format, the song 'disappears' from the Player and no 'backing track' is heard ...
An mp3 format recording can be made using a
midi file in the Player and playing and singing over it, but not an mp3 file.
I believe this is an additional functionality of the Pa4X ...
If someone can prove me wrong on this, I would greatly appreciate it ...