15 - 30 minutes is a little unrealistic. and as for splitting an mp3 into different instruments that's not possible in BIAB and RB as far as i know - or indded in any program the way you describe.

try this post for a way of splitting audio tracks

https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=605070#Post605070

but the results may not be of the quality you want to use as backing tracks for a live performance.

this thread shows you how to add tracks to an imported mp3

https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=629469#Post629469

but that is just a solo performance needing added backing tracks.

maybe the best way forward is high quality midi tracks which you can easily import and split the instruments in RealBand.

here's a thread on high quality midis.
https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=631081&gonew=1#UNREAD

get a high quality midi

import it into RB so the instruments appear on separate tracks.

mute the instrument you play and mute the melody if you are going to sing it.

add realtracks if you like.

export to a wav file, open in audacity and then export as an mp3 (that's how i get metadata to appear on the file - i'm not sure how it can be done in simple mp3 export from RB).


alternatively, you can open the mp3 in BIAB and detect the chords and tempo. then you can vary the style in BIAB but as far as i know you can't split the instruments as you want from the mp3. you'll have the mp3 as the audio track and BIAB tracks - midi or Real will sound strange if played alongside the original mix.

and please be aware that if you use midi as i suggest you will need a good quality soft synth or the sound will not be good enough for backing tracks.

BIAB and RB are great programs but they can't circumnavigate the physics of audio recording so for backing tracks why not stick to commercial high quality midis on which you can mute tracks as you like and change keys if necessary.

Last edited by Bob Calver; 12/19/20 12:30 PM.