What do you need a manual for? If it's active as you're sitting with it in your lap, the top most knob will be volume, the left knob will be pickup blend, and the other two will be bass and treble cut/boost, you can of course find this all out by turning them
You'll know which is the volume knob by the obvious change in volume, and to find out which is the blend knob turn it one way and tap the pickups with a screwdriver then turn it the other way and tap the same pickup. Then to find out which tone knob is which just turn up the remaining two on full one at a time, and it will become apparent what does what, pretty simple really Hope that helped
And welcome to to the forum, those peavey basses are meant to be pretty damn good!