almost linear with a slight bump [...] similar to the Orange ALPS [...] except the bump is less pronounced [...] The click is also less audible than Cherry MX Blue.
What are you comparing "slight bump" to, besides orange Alps? The amount of tactile feel should be relatively similar to orange Alps, maybe slightly but not substantially less.
I suspect that at some point this keyboard was stored with all the keys held down for an extended period of time, bending all the click leaves slightly out of shape and reducing the click.
The sound of new blue Alps switches is different than MX blue, but in general should be comparable in volume. (Though this depends a whole lot on the context; MX blue switches are a plastic-on-plastic click which makes almost no sound for a loose switch, but can reverberate quite a bit with the right keycaps and case.)