All of those tones you like are overdriven. That's the "growl" you're hearing. Go get yourself one of these:
This was something I was considering getting. I like the sound of the pedal; probably more than the POD's Ampeg sims.
By the samples you've provided I'm assuming that growl is the almost male vocal like guttural throatiness?
Yeah, it's less of a high end "clank" I want, and more of that midrange growl. I can get that high-end clank no problem, but the midrange sounds very, very flat.
I wanted a growly, Geddy-like tone since I first started playing, and the best method to achieve it (for me) was simply learning to strengthen my attack without overworking my fingers. It's really easy to get a hard-plucking, growly tone with hard attack and, if necessary, a teeny bit of OD.
Don't think you'll get anywhere near as growly as Geddy without Roto 66s and quite hard attack.
I'm doing almost exactly all that. I beat the poopie out of the strings, I have a slight overdrive with my sound (The Gallien Krueger sim on the POD is actually very easy to overdrive, but I might trying the preamp gain instead of the power amp gain as mentioned above), and I'm even using Roto SB66 strings.
This is the epitome of P bass growl.
That's pretty much the sound I had in mind. You hear that gutteral midrange grind/growl, a bright attack, and the low end still sounds full.
More importantly... what color pick guard is the OP using.
Invisible. Would tortoiseshell help? Or would the midrange be a bit too strong? Would using B/W/B be a bit more tame?
The first thing that's usually wrong when people say they can't get a P bass sound is that they are scooping out too much of the mids that actually are the P's trademark. The next is that they are trying to get one rig's sound through another. In any case, always beware of buying more stuff as an answer.
Trust me, I'm not scooping the mids at all. If anything, I'm going overboard with them.

I'm not trying to cop anyone's tone exactly, but I'm trying to get that growl I hear in a bunch of P-bass tones I hear. It's just odd that I can't hear it at all with my sound.
Like others have stated, maybe try different strings, or even different preamp that adds a little grit or OD. However, different basses have different "sweet spots", the area where your righthand plays tends to sound sweetest to your ears. Often, the sweet spot will also bring out the best qualities of the best. Try picking around the pup, bridge, or closer to the neck to find your basses sweet spot.
I think I'll stick with the Rotos. If I end up switching, I'll probably try the DRs or Dunlops as said above, but I quite like the Rotos from everything I've heard. As for the preamp, I'm definitely gonna grab one eventually, I've been eyeing EMG or Aguilar, but I wanna swap pickups first since I'm assuming Aria's stock pickups aren't the greatest.
When it comes to my "sweeet spot", it definitely sounds best near the neck. It's where I pick most of the time.
Uuugh...get a real P Bass..
Sure. Send me yours.
