To use Dimension Pro in multitimbral mode in Logic, you must create a custom environment as follows:

1. Insert Dimension Pro (or Rapture) into an Instrument Track
2. Open Dimension Pro Options dialog
3. Enable 'Set Program As Multitimbral' and select OK

   

4. Open Logic's Environment window: Apple Command+8
5. Select Audio Environment
6. Scroll to find instrument track that contains Dimension Pro

   

7. From the New menu add Multi Instrument
8. Connect a virtual cable from the Multi Instrument to the Audio Instrument into which Dimension Pro is inserted

   

9. When 'Cable and Channel Port is set!' message appears, choose 'Remove'

   

10. In the Multi Instrument, click channels 1-4 to make them active
11. Rename Multi Instrument to Dimension Pro
12. Select Dimension Pro Instrument Track and set MIDI Ch to all
13. In the Arrange Window, click+hold Dimension Pro track
14. Navigate through menu Audio | Dimension Pro | 1 Grand Piano (note: Grand Piano represents Logic's default GM patch name and does not indicate a Dimension Pro sound program)

    

15. From the Track menu, choose 'Create With Next Instrument' Mac: Apple Command+Shift or Win: Ctrl+Shift+Enter
16. In Dimension Pro, select Elements 1-4 and load the desired Multisample (be sure to select all the elements that you intend to use)