I use the basslines blackout 2band in my bc rich eagle guitar. Excellent tonal range. I use the same reble setting of 6k as I do in my bass with it. It does 3 things for the sound. 1. Converts to lowZ giving the same sound advantages of lowz. Tighter bass, more detail to the sound lows thru highs. 2. Boost the signal so sustain is quite nicely increased and j harmonics come super easy with no harshness. 3. Gives much more musical tone shaping then the std passive tone control. Both bass boost and cut work well as well as treble boost and cut. Treble boost avoids harhness to imo. I Use bc rich bdsm bridge pup and emg h1 neck pup. The emg h1 isnt quite as hot as the bc rich bdsm neck and gives a more trad 70's overdriven very articulate and crunchy tone. Combined with the bc rich bdsm bridge pup I can go from more trad crunchy rock to metal no problem and all inbetween. I musicalness of the basslines blackout works very well for better tone shaping with electric guitar to me and is much better then the competition guitar preamps imo.
By boosting bass a little & cutting treble a little I can get thicker bridge pup sound or really thick neck pup sound. By boosting treble just a little and backing off the bass for neck pup I can get a more balanced bridge pup sound that avoids the overly trebly to me sound one normally gets from soloing the bridge pup.
Simple nothing fancy soundtest vid here: Link Removed The soundtest one. Eagle guitar with basslines blackout preamp and warlock bass with same preamp. Bass is just adding groove nothing fancy. Guitar mainly rythmic thing. Again nothing fancy.
The preamps signal boost also works better then the emg afterburner I had in a previous jackson guitar for both sound detail and sustain as well as further driving overdrive/distortion effects. Similair to stacking 2 marshall govner or proco rats into each other actually.
Added pic. controls are: neck vol, 3way pup selector, bridge volume, basslines blackout 2band eq with stacked bass/treble.