There is a distinct sound I have only heard on Mark VI saxes. It seems to happen when transitioning between notes. I was at a music club the other week and a local sax repairman/musician/close friend of mine was playing a solo on an older Vito tenor and I heard that Mark VI sound when he transitioned between lower notes on a solo. I later praised him for a good solo and told him that it sounded like a Mark VI on the lower notes. He told me that he put metal domed resonators on only the bell keys up to Eb. I was "hooked" on that sound and promply ordered some oversized reso-tech domed resonators for my '54 Martin tenor. They should be in at the end of the week. Does anyone have any experience with the effects of resonators. Because most people I talk to say they don't make any difference in the sound, that it just adds volume. Whats your experience with them? Has anyone ever played a Martin with domed metal resos?