Just a comment, not exactly sure what you meant by "a part of a sound" here, but the effects settings have been always been saved as part of a "program" (e.g. in the NS2 it can consist of several engines: 2 organs, 2 pianos, 2 synths) and you could assign effects to those, although some of those exclusively to one engine or another in each of the two slots available per program) . What it is new in the NS4 is that different sound engines can have their individual effects.