I recently bought a LeBlanc with a stamped serial # and made inTaiwan. Paid $400.00 no dents dings scratches, everything works . very clean . I am having a little difficulty with the octave key and g#. Also after playing for about an hour I start to squeak a bit. Have been playing about 6 Mos. I started back with an older model Conn 10M series. But very difficult to play. Did I scew up. I am using Rico Royale #2 hard rubber mouthpiece. I have experimented with toanl quality by using socks, mutes etc. Can U help me ?