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Forgot to add. Chris explained how to use the GEQ for finding the bad frequencies. An RTA is a Real-Time Analyzer. There is an RTA available for an ipod touch or ipad. Do a search for AudioTools. Studio Six is the creator. It does cost $20. Other toys are also included (SPL meter). The mics on ipads and ipods are quite good and I know of a few very reputable sound engineers that swear by the package.

Rick Kohrs
Good Shepherd Lutheran Church – West Campus
Verona, WI