1: The OBP-3 switch is a mid-freq selector switch, not really a slap-contour switch. It chooses between 400 and 800 Hz, and then the pot allows some +/- 16 dB boost or cut.
On the stand, I have the 2-bass version of that stand. I have found that the bottom suport arms are soft enough that (with some muscle) I could bend the one near the jack down, and the other one up, so that the bass rests perfectly vertically with the legs completely spread. The only trick is not to bend the jack-side arm down too far, or a straight cord plug will hit the floor and bend the cable. (Guess how I figured THAT out...
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On the stand, I have the 2-bass version of that stand. I have found that the bottom suport arms are soft enough that (with some muscle) I could bend the one near the jack down, and the other one up, so that the bass rests perfectly vertically with the legs completely spread. The only trick is not to bend the jack-side arm down too far, or a straight cord plug will hit the floor and bend the cable. (Guess how I figured THAT out...