Hi all I'd like to add GraphTech's Ghost piezo saddle & Acousti-Phonic bass preamp to my MIJ 62 RI P-bass (now strung with Fender 9050ML strings). I still hesitate how to control 2 pickups. Thinking of 3 methods. 1. Mag vol + piezo vol + mag tone 2. Master vol + master tone + blend 3. Master vol + blend: Like Dave251's beautiful electroCoustic bass. Please comment pros ad cons of above methods.