I don’t think lacquer (cellulose type or expoxy type) or plating, diffent material of the the sax and parts, thick or thin wall, straight or rolled toneholes … affect the tone of a saxophone. It’s more about the durability.
What makes the tone and character of a sax is the design/construction of the tube (dimensions, bore and taper), the tonholes placement on the tube and the angle/shape of the toneholes. Of course, the sax should be wellbuilt. So what do we hear when we play a tone on a sax? A groundtone and overtones. Every sax is unique when it comes to this.
IMO different types pads don’t affect the tone at all. Resonators/reflectors makes the sax louder and so does a big bell.
I can feel some vibrations when I play on some of my saxes. I have some Indiana saxes (secondline) that I can feel some vibrations when I play the low tones and push hard. I think it’s beacause the saxes are leaking. The keys are not that sturdy. That’s why these saxes were sold as an cheaper alternative.
Thomas