The Warm-up reduces instrument output to a whisper, losing approximately -25dB to -35dB. With this high level of sound reduction, professionals have no hesitation in practicing in a hotel room during their tour, and it becomes possible to do long tones virtually silently backstage, or even gear up for that high section in the pit or on the bandstand.

One of the reasons that the Best Brass Warm-up is endorsed by many professionals is that it's very handy. Warm-up has the most compact size of all practice/silent mutes on the market and can be stored in most bells, so it is convenient to carry around. Now, anybody can Warm-up literally anywhere at any time, a most important thing for top players who everyday travel all across the world.