1) I think Squire's bass lost the bridge PU for a while. Seems he did a lot of Rick work with just the bridge...I can never be like him, so I don't deal with worrying about his tone. I just enjoy it.
2) I'm not playing my 4001 much lately. It's a 75, with the capped bridge PU. I usually would use both PU's but vary the blend. My neck PU is far stronger...usually I'd have it at about 8 to have the outputs about equal. I also vary the tones, usually keeping both at about half way as a base-line.
3) My number 1 is my 4004L now. I will usually use both PU's, and vary the tone. Again, I usually keep it at about half way. I hurt my right index finger recently (puncture wound) so tonight I was using a pick, and actually liked the tone out of my amp for the first time in a while. Bought a few new felt mandolin picks...might practice a bit more with a pick and do the Jeff Rath thing and vary between pick and fingers...
4) I also have a fretless J bass with flats. Recently put in humbuckers on that puppy, but usually I just run that with both PU's full (creates kind of a scooped profile), again with the tone at about 1/2 way. Not sure what will happen with a pick on that one...actually don't use it in the band much. Last rehearsal I used it made me think I have to tweak the PU heights at bit...seemed that my E string was a bit too boomy. With one PU backed off this bass you get a more middy sound, with the neck having a little more bass presence.
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