If you are talking about the style parts; the answer is yes.
I have done it several times.
1. Choose a style
2. Go to Menu to the right next to the display
3. Click on digital recording (style)
4. Click on style Creator
5. Stay on the basic tap
6. Choose Variation button (A-D) you want to edit (big blue buttons. Or Intro/Ending
7. Click OK in the display
8. Click the mixing console twice
9. Chance the volume to your liking on any Style part
10. Repeat step 6-9 as needed
11. Hit Exit to get back to the style creator page
12. Use the tap button to go to Style Assembly
13. Click save and choose destination.
Hope this helps
Eric
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Genos, PSR-S970, TC Helicon VoiceLive3, Mackie 802-VLZ3 Mixer, 2 Bose L1 Pro16, Electro-Voice ZXA1 Subwoofer