Eq'ing before hand is/can be good but from a mixing point of view i'd advice to keep the eq neutral. This is to stay in terms of non destructive editing/mixing once youve tracked the mpc which gives you better control of the mix opposed to mixing on the mpc itself.
Not saying it cant be done but im following the principle that what you sample is already mastered. Its easy to compensate the quality of your speakers with the "fatness" of sound but in most cases, the sound is right already.
I'd half disagree with the firs tthing however... although, I too, love having a neutral sound/sample, sometimes it is best to "commit" to a sound, as it saves time and can improve your mix, because you're making things fit from the start, as opposed to trying to make everything fit later.
dude i love dirth but this becomes even better when knowing the ethics, sorry if i dont give much credit to the ghetto style of doing things hehe. Things ive seen and liked are SP's with parametric moog eq's, my vestax eq's on the pro5 and 7 arent sufficient to correct it properly.
Depending on the daw you work with, you could make a monitormix and eq there while doing undestructive tracking. Once tracked you can copy/paste the settings from the your monitoring or properly touch up/correct the material.
idk about labeling a sample 'safe' just because its already been mastered. I think its a matter of what you're looking for in the end. I say that because most of the samples that we use were mastered 40 or so yrs ago as opposed to sampling something of today. Everything has changed from the gear and monitors that they used back then to what people want to hear now. 70's music in general is just so dull compared to todays music.
I love big gritty-ass drums too.
What I'm saying though is if a snare for example has already been grittified to the max, then had mastering on top of it, then you process it and crunch it even more, it still has to go to mastering. Could easily end up way over processed/clipped/distorted before you realise it.