BiaB wouldn't normally replace your own notation in the Melody or Soloist tracks, but it would replace any changes you made to other tracks unless you froze those tracks.

The Mute setting is not saved with individual songs, it is global, however, the volume settings are saved, so you could set the volume to zero and save the song.

Making the Mute setting local and not global has been requested many times.

BIAB & RB2025 Win.(Audiophile), Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors, AKG K271 Studio H'phones