Find a good copy of one of these test records: (http://www.ebay.com/itm/LP-SHURE-PHONO-CARTRIDGE-TRACKABILITY-TEST-RECORD-NEW-/350505083217?pt=Music_on_Vinyl&hash=item519bbb2151) (http://www.audiophileusa.com/item.cfm?record=81920&c=1&kw=Accessory) (http://www.elusivedisc.com/prodinfo.asp?number=CLELP43039) I own the first two I listed, and a couple others that are no longer available. They are very useful tools. I'll bet you find that your stylus is mistracking, at the higher groove modulation levels. When Sheffield Labs came out with their 'Growing Up in Hollywood Town' direct to disc; some complained of mistracking, when Amanda McBroom hit some of the same notes as the violins, on the cut, 'Amanda'. Mine never did, but- I heard the distortion on a couple other systems. It was ugly!