Repost from the Fender Rumble discussion....
I use the Rumble 100 with my Shen. I have an LR Baggs between them. I struggle with settings that make the string volumes similar without sounding artificial. Best so far: I notch between D and G and keep the preamp gain low. I use the Rumble's master to increase volume -- using the Baggs volume knob above nominal causes really crazy bad sound.