Not wanting to steal the aged one's thunder but when he's recovered from excess hay consumption he'll be along to tell you all about Streamliners and Shuttles from his days as main man at GenzBenz.
I has now, in the suggestions box at least.
The trouble with good ideas is you can't pin them all at the tops of forums for the three times a year somebody wants to avail of them. The first page would be the good ideas page.
Yep. I don't play with a pick but I can get close to that by digging in extra hard with fingertips closer to the bridge, without touching a knob, so long as I have a drive pedal that is touch sensitive to give it the jûs.
One man's unnecessary noise is another's juicy tone and the reason for the extra feature. If you only do clean there's the other half? of the amps out there for you.
When an amp has a 'Gain' knob and a 'Level' knob at the front of the preamp the gain knob is essentially a tone knob that functions by increasing level and the level knob balances the total that goes onward.
A rule of thumb is to provide optimal signal through each stage by decreasing or increasing output to suit the following stage. So best is most often attained by giving a strong enough signal on to the preamp via the input gain.
Some preamps will give you more flavour by pushing them into overdrive if that's what you are into.
A too weak signal generally isn't going to spin your wheels. On the other hand I found a very pleasing tone in my Trace with an active EUB that sounded best when only just getting the light on.
So no hard and fast rules really.
The master output knob is usually a simple attenuation that you turn 'down' to get more volume ie less attenuation.
Some people just don't want to know it seems.
A P Deluxe has an 18v preamp that you can switch out for passive mode. Either mode lets you go 100% P pickup. The body is a little on the slim side.
P Deluxes cost about that new if you get a Spanish speaking one and tonally give you exactly what you are looking for, plus a whole lot of other tones you didn't ask for but they are free. Market served.
It's only a J when you engage the bridge pickup. Otherwise it's a P. Nobody cares what pickups are on your bass they only care that you sound right, if at all, but that's by the by if you only care what you sound like.