When I first started getting to know Ralph Morgan we sometimes talked about Rovner ligatures. If I remember correctly he and Phil Rovner were working on a ligature together, however, I don't think anything came from that. I do remember that Ralph told me the best ligature he ever had was an old Selmer that was pure silver. He said several sax guys tried to get him to write an amount on a blank check but he never sold it.
It's been my feeling that because of the very high quality hard rubber formula used by Ralph one may be able to more readily discern tonal and performance differences with various ligatures than with mouthpieces made from a lesser quality of hard rubber. At least that has been my experience.
I find it ironic that Ralph seemed to recommend Rovner ligatures. Over a period of a year or two I tried ALL of the Rovners. Then, when I tried a FL lig it was 100% clear to me how much Rovners dampened my sound. It was like a night and day difference. My favorite FL lig was the silver version. I found it to have a better level of projection than gold.
I was entirely happy with FL ligs on all of my Morgan mouthpieces for 4-5 years. However, when I made a decision to switch to Legere I sadly discovered that FL ligs do not seal Legere reeds properly. I then had to search for a lig that works well with Legere.
After a long search I settled on the Vandoren Klassik string ligature. I've talked about it on other threads so I won't repeat myself here. But, simply put, it's been better for me (in terms of tonal quality, projection, and response) than ANY metal or fabric ligature I've used in the past. The only problem I have is Vandoren doesn't make one for bass clarinet.
http://1stopclarinet.stores.yahoo.net/vaklalsaxlil.html
The alto sax version of the Klassik expands enough to easily fit my Morgan tenor mouthpiece.
Roger