I currently have a Peavey Grind 4 BXP and was wanting to upgrade either my pickups or pots for better tone control. The Grind has the stock passive pups. Has anyone used the ToneStyler pots from Stellartone? I see where they are for passive pups only and do not require any batteries. I just wanted to get feedback before I decide between going with these pots or new pups. Please help.