i have read lots of threads about this issue and it is just driving me nuts! i have a p bass that is a bit of a Ho but i just absolutely love it (the sound the color the bruttiness of it) but rarely play anymore because i recently fell in love with the whole jazz bridge pup thing (jaco yawn yawn WICKED !). basically i miss my Ho and was thinking of putting in a jazz pup at the bridge but am like stressed out by posts saying that it affects the P bass pickup's sound . surely this is only when you have both pickups coming thru? i was thinking of taking out the tone pot and making this a vol for the jazz pup. stuff the tone control i hardly ever use it anyway (just roll in the neck pup on my jazz if i want to mellow the bridge one - and less hum what do you know!). so with this setup and just the P pup vol up it should be the same as it is now (pre hotrod). in other words how do added pups affect already installed pups!!!