I have been playing for years and also have mixed live sound many, many times. I think I have at least a good fundamental understanding of eq. But sound sculpting as a sound engineer is different from sound sculpting as a bass player, at least in the live performance realm. As a sound engineer, my only focus is sculpting the sound to perfection. And I do this continually during a performance. I was never one to set and forget when running a board.) As a bass player, my primary goal is to give my best performance. I find that I am only able to focus on tweaking the sound, via signal processing anyway, before the show starts, between sets and occasionally between songs. (The later usually is reserved for times when it is really necessary.) Most of the time I only have a short time to dial out the bad and dial in the good. My current amp, a Genz Benz ShuttleMax 9.2, has tons of tone-shaping options. It has two preamp stages with two shelving and two semi-parametric mids each. Plus the preamps can be combined! Add to that a variable bass boost, mid cut, and treble boost which can be controlled by foot switches. There is so much tone shaping, that after 3 months of playing with this awesome amp, I am only beginning to understand how to use it effectively. Add in eq options on the instrument, effects pedals, etc, it gets overwhelming pretty quickly I practice at home so that I can use my time efficiently on stage. (Forget rehearsal, my band-mates have little patience with and even less appreciation for tone tweaking.) i work on identifying the issue and finding solution quickly. This usually means dial out the bad, i.e. muddy mids, boomy bass, shrieking highs. Then there is adding in the good which means getting the right emotional content into the sound. Angry, sexy, powerful, gentle, caressing, aggressive, etc. But I still am have not really gotten to the point where I can go exactly where I want quickly. I realize that the problem is that I really don't know exactly what I want. I don't have 'that sound' in my head. I only have a rough idea at best. I fiddle until I found something that i like or I discover something that I had not intended but sounds fantastic anyway. Most of the time, I just leave it alone, cause I am just too damn busy having fun playing. Then I find myself looking down at the foot switch with the three eq controls and realizing that I haven't touched it all night. So, hats off to the guys out there that have a signature sound. Guys like Aston "Family Man" Barrett, Lemmy Kilmister, and Geddy Lee. I don't think I am mature enough musically to get to that point. In the mean time I will keep tweaking the controls until get that "Aha!" moment. At least for now I like the journey more than the destination.