It's two different things:
I was wondering how you chart the bass parts? Pumpkins songs are notorious for having hard to decipher bass parts. Do you look up tabs/performances to get a general idea or do you have a really good ear for the bass lines? Thanks.
1) EQ - I equalize the audio to favor the bass frequencies to make the bass part louder.
2) Pitch - I shift the bass EQ audio up two octaves so that the bass melody can be easily heard among the muffled tones.
I always use these two things together. If they're not enough, then yeah I might look online for tabs or cover videos. I mainly use live performances for drums/vocal lines.