Hi all! I have had a Bryston Electronics system and Von Schweikert speakers for the last 15 years. Been wanting to help a friend out with his system, and have been looking for 5.1 warble frequency response tracks. Haven’t had any luck finding anything useful, other than people pointing to REW. There has to be some surround response tracks available somewhere, I just can’t figure out where they would be. Any help would be appreciated!