Not exactly, sure you want good quality samples, but say you're layering a kick or clap/snare, some samples may just sound bad together, so picking the right ones to make a good kick or clap/snare is important. Even sequencing drums, not everything is going to work well together, picking the right samples for your sequence to work well is important.
I was more so talking about the whole mix in general though. Say you have a drop with a good lead going on but you want to add more elements, this is where you have to watch for what part of the frequency spectrum the new elements are most dominant, you want to be sure the sounds you are using are not going to over power or drown out your lead. If there's part of the spectrum you're trying to fill, use something that fills that part of the spectrum, don't throw any old synth in there & EQ it to fill that specific part.
Having a hard time trying to explain it, but hopefully that helps a little bit hah
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Yeah, I get what you're trying to say. Should I have an eq on the master channel(not to actually EQ), but just to see where all the frequency ranges are peaking and where I have free space? Would that be considered a normal technique to do? lol