I’ve been doing lessons and practicing with the EQ on the amp flat and the volume controls and tone controls on the bass wide open. (Passive PJ)
Cranking the midrange on the amp EQ really highlights muting errors, string noise, unwanted noise, everything. If I can make it sound good with all that information, I’ll sound great when I EQ for pleasing tone.
I started doing this yesterday and I have a lot of work to do.
I also recommend using round wound strings. My bass came with flats—when I put on rounds about halfway through this course, they reveal several flaws in technique that flatwounds were masking.