Clearly the heresy has clouded your mind and reasoning ability!

How'd you fix it? Echo and reverb can be an obnoxious beast to troubleshoot. Most often I've found that you need to go into the sound panel and mute your microphone and line in on the output. Sometimes muting those on the input can help as well. Some of the newer drivers also allow for different effects, much like Dolby does, such as Hall, Stadium, etc etc. Check to see if those are set.