probably off topic and much too large for one single post, for sure discussed a million times before too...
j., just move it if I once again set my feet ankle deep into the obvious dogsh... everyone describes a huge cycle just to don't do the same...
Even if there are different materials to work on from, we often use the same tools to reach a certain sound for certain instruments.
For vocals:
I specialized in using following chain (I don't like mud and emphasize mostly on breath and fragility/airy)
waves renDe-esser, LinLoEQ (lo cut @ 120 or up to 160), c4 (hard comp for all bands, 20-120/160, 120/160-300, 300-3k, 3k-20k),
RenEQ6, LA-2A, Magneto (Steinberg plug, tape sim), L2(as output plug to be tweaked with the vol.fader)
For guitar:
2 settings, 1st clean (lo cut 120, 6k hi shelv up to 9/12db)
2nd heavy (lo cut 160, less 500, 6k hi shelv down to 9db)
in general:
LinLoEQ (lo cut @ 120/160), Fairchild, RenEQ4 (cleaning 500, emph. 2k, hi shelv 6k), c4 (mid crunch @ 260/300-3k), L2 (tweaking out 3-6db @ 0,3ms release)
for bass:
splitting up in 2:
1st: linloEq (lo cut @120/160), LA-2A, C4, RenEQ6 (hi shelv @ 3k), L2
2nd: LinloEQ (lo cut @60/80, hi cut@ 120/160), , Rencomp,Renbass (@120/160), RenEQ2, L2
So probably I'm a bad Producer 'cause I'm pushing "my" sound on every musician I work with (clarity and frequency separation), but in most cases I do work arrangements out, get the lyrics with them, and sometimes teach them how to play
so I get a pretty wide overview of what the band/artist wants to express, and if she/he/they do play certain instruments AND a certain music genre then they have(?, yes I'm a dictator) to accept that it needs certain kind of treatments to achieve certain emotions.
if they want extra low guitars, they should get a bass or a baritone guitar, that's what they're made for...