I don't disagree with the technical description of the cap issue, but I am just mystified about the "one trick pony" rap. I'm also left a little confused why so many are so gushing about the cap bypass, when the time I saw it demonstrated I was left a little less moved.
The only uncapped bass I've played is one of Andy Winters' - not sure which one, maybe he'd remember? - and it did make a huge difference in the bridge PU tone. IMHO it made it too much like the neck. But that's probably because I am used to using the neck PU as my major tone source, so I tended to blend in various amounts of the thin bridge PU to brighten the sound.
I think I am different from most players in that I usually drive my tone with the volume and tone pots "in the middle". The capped 4001 allowed me to tweak the tone a lot as the songs moved along.
As for the "Rick" clank, I found that playing with the tone cut all the way usually made for a deep rich tone, and especially with flats on it I felt my 4001 could "out P-Bass a P-Bass"...
Obviously my mileage varies significantly from most. I just never felt it necessary to uncap my 4001.
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