My answer is probably too simplistic but my workflow is:

1. BIAB to generate the song that I want - with the thin instruments ==> Save the song
2. Open the song in RB (freeze the tracks so they don't re-generate)
3. Change the tracks' VST(s) to one of my choice e.g. GPO for orchestral / soundfont player / Syntheway choir etc. This replaces the 'thin' sound
4. Add some realtracks / realdrums if appropriate
5. Add any effects such as reverb
6. In the audio menu - mixdown everything to a stereo wave or individual waves / tracks
6a. Sometimes I open the wave(s) in FL Studio and do some further refinement for mastering

7. Enjoy the rewards that come from having a chart storming piece of music

It helps if you can visualise (or is that auralise ?) the final piece with the better sounding instruments at the time you create it in BIAB. The thin sounds are then more of a sketch.

I haven't managed number 7 yet by the way but I'm working hard on it and having some creative fun along the way.

Enjoy.

Regards.


Mike.

SongBrain - AI Generator
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