I just re-purchased an Electrovoice RE-20 kick drum mic (I used to have one years ago and sold it). I forget what position the bass roll off switch should be in for miking my kick drum. For anyone who knows or uses one, should it be in the "flat' or "tilted' position? Also, any suggestions on mic placement for the best sound? I know I'll be experimenting, but some insight would be helpful. Thanks in advance!