If anyone is hooking up an Aguilar preamp, I just want to inform you the the diagrams for the vol-blend is wrong. It took me days to fix the problem only to find out Aguilar drew it wrong. Follow the vol vol diagram which shows blue wire (output) on the outside prong and and input wire from blend (or straight from pickups) on the middle prong. If you follow their diagram for vol blend, you will have volume but no volume control. You will have constant volume all the time.