(Or at least new to me)
Since I began playing trumpet a year ago I've used a Vincent Bach 5C mp. I felt like a change and tried out a bunch of mps and ended up getting a 1D. I really liked the bright sound. I immediately noticed I had to work much harder to control the sound, especially in the lower register. When I switched back to the 5C, just for yucks, it seemed like my tone improved, and overall I had way more control over notes in all ranges (up to my max A above the staff).
Did I just hit upon another practice technique? I guess it makes sense, like practicing a difficult passage at a tempo quicker than you'll ever need it in a performance.