The information in this article applies to:

• SONAR 4 Producer Edition 

If a SONAR 4 project is using the Lexicon Pantheon Surround plug-in, an error may occur if you change the project's surround format form 5.1 to a surround format containing more than 6 channels (7.1,8.1,etc) The Lexicon Pantheon Surround plug-in is only Compatible with surround formats of 6 channels or less (5.1, Quad, etc).

Also, if the current surround  formant is already set to 70. and above, the Lexicon Pantheon Surround plug-in will fail to patch in an effect bin.