See if you can add some music for the clarinet, the trombone and the bass. You can make the trombone part and the clarinet part quite similar to the trumpet part if you want. The bass part could be similar to the lowest piano part. Perhaps you could also add a kit part. Go to create instruments and find the kit. Remember that you will need to save it in your own documents for the changes to be kept.
Remember to set the Play-playback devices to Kontakt otherwise it will not sound right. If you get stuck, pair up with someone.