I'm interpreting your question a bit differently than the others who have answered. This question sounds to me as if you are referencing bringing the same 'instrument' in and out at different sections of your song. It seems the others are interpreting 'instrument' to mean a repeating riff or the same musical phrase in different sections of a BIAB song.

Bringing the same instrument in and out at different bars and in different sections is very easy to do in BIAB and no DAW or other software is necessary. You can also vary the instrument of a track so for instance you can have a portion of your song have a lead guitar and in another section of the song, have the same track as the lead guitar play a pedal steel guitar and switch back and forth between the two (or more). The limitation is they cannot both play at the same time. For me, my experience has been that BIAB does a great job anticipating these changes and the transition is very smooth and musical.

I'm not completely clear to how you meant the question and probably have guessed wrong since every other comment seems to indicate you are looking to repeat a phrase. They are correct, RealBand works wonderfully if that is your intent.

Charlie

BIAB 2025:RB 2025, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.