I’m new to the Octa and I guess my advice is just a variation of ‘garbage in, garbage out’, but I’d personally try and get the sound as close to how I want it before I sample it - of course that doesn’t always happen but it’s what I’d aim for.
At least when we’re talking about clinical sampling, like preparing a kick or recording a loop.
If it’s more creative mixing, or you’re making corrections because you’ve mangled the sample etc. then it makes sense but otherwise feels like a waste of an FX to me.
I guess you don’t always know how you want to EQ your tracks before you have your whole mix, but a lot of the basics can be covered.
Admitedly this is a bit more straightforward for me as I sample primarily from my mixer which has its own analog EQ and filter, but if we’re talking ‘set and forget’ EQ it makes sense to me for that to be sorted in the sample - or at the very least resampled.