First, the MAC version does not have RealBand so although that is a great solution for your issue, you will not be able to utilize it.

All is not lost. Any DAW can use audio tracks you generate in BIAB. Most people do not complete their projects entirely in BIAB and few use RealBand although it is capable to finish a project. It really boils down to personal preference and having experience with a DAW or hardware recording gear.

Garageband is a very capable DAW that will work well for you.

One method to repeat certain riffs your RealTrack generates is to export the track to a DAW, cut out the riff and import it back into Biab. Importing audio into BIAB will offer options to which bar and beat to place the audio and whether to merge with the track or overwrite it. Merging will allow you to drop the riff onto the audio track multiple times.

You can also easily place the riff multiple times in the DAW if you export rendered audio of the BIAB project into the DAW.

BIAB Ultra Pak+ 2024:RB 2024, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.