I have a bass guitar with a J-bass on the neck and MM style passive pick-ups on the bridge with active 2-band electronics. I need to replace the pots but don't know if I would choose the 250K or 500K (or 25K?). Also, I went to stewmac.com and there are so many options: Bass Cut/Boost Pot: 25K? 250K? 500K? Treble Cut/Boost Pot: 25K? 250K? 500K? Blend Pot: 250K? 500K? Push-Pull Pot (for active to passive mode): 25K? 250K? 500K? (note: did not see 25K for blend pot) Can you help me guys? thanks!