Yamaha Silent Brass STX 

I try to show how the Yamaha's STX works; how it will sound with headphones or earbuds in, how it works with incoming music, the two sound options, how quiet it is for those sitting nearby... As thorough as can I can be. :)
A good question came up, 'What trumpet are you playing?' Well, it's a Yamaha 8310Z (Generation 1). :)