The search function seems to only go through documents by default and not discussions.  Under the "What:" in the area below where you type what you want to find, choose "all" or the first icon afterward indicating discussions if you want to search the discussions.

This is what you should get searching only the discussions for global tempo:

http://line6.com/support/search.jspa?resultTypes=message&dateRange=all&peopleEnabled=false&q=global+tempo&containerType=&container=&containerName=&username=&rankBy=relevance&numResults=15

Hey LazyLightning,

  gregr was correct in the fact that once you enter your search, on the search results page click the symbol of two speech bubbles next to where it says "What:". You might also want to change the sort by option to date for more recent entries.

  For information about the HD500 Global Tempo, please reference the HD500 Advanced User's guide page 2.8 for information about adjusting the global tempo of the POD HD500.