rharv:
Thanks for your reply. I made sure the "Send Realtime Messages" radio button was turned on in the MIDI OUT window, but unfortunately it doesn't make any difference. As I stated in my original post, the process works OK with my other important synth (ARIA/Garritan) and clicking the 'TRANSMIT' button in the EVENT BOX sends the command to EDIROL, but PT2011 is not sending commands to EDIROL during realtime processing. I'm beginning to think that a glitch has developed in the EDIROL software but ROLAND no longer offers technical support. I've tried uninstalling the EDIROL software and re-instaling, but NG. Any other thoughts you (or anyone) have, I'm willing to try anything.

Thanks again for your suggestion,
mespo55