Using my MXR Bass Octave Deluxe recently with a P bass and the sound guy said there was too much mid boost when I used it. I generally set all the knobs roughly at 12:00 with the mod boost on. The mid boost is at factory default so about 9 db (half way on the trim) boost at 400hz. So I ended up backing off the dry to about 10:00 with the mid boost still on and it did the trick. I have tried the mid boost at the 850hz setting but it just seems to lose some punch in the mix then, even though it sounds better at that frequency when playing on my own. If you're using a P style bass, or a J with both of neck pickup, how do set the mid boost?