In Logic Pro and Logic Express 7.0 and later, PlatinumVerb will play below the indicated Mix level whenever you insert it in a bus. Though the PlatinumVerb interface shows a Mix level of 100 percent, it actually plays at about 20 percent. This affects every instance of PlatinumVerb that you insert in a bus.
To resolve this issue, move the Mix level fader down a bit, and then bring it back to 100 percent.
This document will be updated as more information becomes available.