I've got a Glockenlang 3 band preamp in my Rbass now. 5 knob setup master vol/balance B/M/T with push/pull bypass on the master volume. It's a very hi fi sounding pre. This bass also has single coils. The glock would sound better with soaps I think. Maybe in a Roscoe or something similar? I want a more aggressive pre with the singles so I bought an Aguilar 3 band pre. Get this great preamp for $120 shipped OBO. It comes fully wired so just connect the pickups.