On some of my recent recordings, the Composer is just not capable of providing a realistic 'backing' for the song, for several reasons such as 2/4 measures being inserted in an otherwise 4/4 time signature or running out of ACP parts. So, on these occasions, I use the 16 track sequencer to provide the 'backing' instead of the Composer. If I use this method when playing live, then I just turn off the Left, Right1 and Right2 tracks on the sequencer and play along with the recording.
This does mean that you have to know the arrangement very well, since the 'backing' is rigid