#1
Just bought a new bass a couple of days ago for a stupidly cheap price from some guy I know and it is pretty much perfect
However, the intonation on the B, E, A, D strings is slightly out so that the strings are slightly flat when I slide up 12 frets. Am I right in believing that to correct this I need to piss about with my saddles? If so, in which direction do I need to move them?

Also, the B string, as they tend to be, is a bit slack for my liking. I don't think there is anyway of tighting the string without changing the gauge of the string without having to change my action, is there?

Thanks
#2
If notes are flat move the saddle forward (ie toward the neck), if notes are sharp move the saddle back.
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#3
Best to get it set up professionally. Then you can add heavier gauge strings at the same time.
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+1
#4
I can tell you now that piss won't help your intonation. However, it does involve the saddles. It's actually a pain in the ass because you have to keep tuning and untuning. It took me about an hour to get my bass's intonation set.