I have a question for the experts out here. I have done some research on the subject but I could not find any satisfactory answers online. I apologize in advance if this has been discussed before. What is the effect (if any) of the window shape on the sound and playability of a mouthpiece? By...

I just purchased a '25 HN White King (http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110510569919) and put my Rousseau JDX5 on it and it sounded awful. I had three other mpc's, but they have no names on them. There is one that sounded fairly good and I noticed it had thicker rails, a...