I find that I can use only two simultaneous midi tracks with output to Hollywood Orchestra. Anymore than 2 midi tracks and they don't output to Hollywood orchestra, but they CAN output to any other synth. My system has 32 GB RAM, 64 bit OS, i7 CPU at 3.50 GHz. Has anybody used Hollywood Orchestra with Sonar Platinum and found this problem (and a solution!)?
Thanks

It comes with 16 track. Put each instrument on a different track

What are you using for midi input?

I have many larger projects with 5-8 instance of Play each of which has 5+ articulations in different midi channels. I've never seen your limitation.
 
You'll have to provide a bit more information to understand what could be wrong.