I remember a tenor sax hanging off my neck was enough work let alone having its entire hard case attached :) It seems, to me, the best solution for all of these issues is just to rent a practice space and go play until your cheeks and lips fall off. I am pretty amazed with how the trumpet output sounds through that Yamaha mute, though - it looks like you could even circuit bend that gadget to do some nasty things to a trumpet's tone.
Yeah, it really is remarkable! Synthesized brass/winds are generally quite bad. I was very skeptical, but watching the video changed my mind. I do have an old trumpet lying around...
I did see a video for the sax case where a person had it mounted on some kind of stand, so that's probably a lot more feasible!
I don't think they're actually synthesizing anything in the traditional sense...just essentially using a DSP to convert sound in the bell to natural room sound.
also a sax player. do those practice bag thingies even work? i'd rather just use my ewi if its really a time of day making actual sound is not allowed.