Try this: after setting the playback of your track to your liking, including using the iReal Pro mixer, touch the Share button, and touch Share Audio from the drop-down menu and then select the format (AAC works well). iReal Pro will then render the audio track (this takes some time) and ask you what to do next. You should select Save to Disk. When you do, iReal Pro will display instructions on how to save your file to your computer's hard drive using iTunes. The files will be located in the "File Sharing" portion of the apps page for your device. From then on, save the audio files to your computer and then copy them to iTunes, and finally sync your device. You should have your audio files available for playback on your device.