Directly from Bjorn....'BBOD > DRD > BPB
Using the Master Volume amp analogy - we can set the BBOD to a setting similar to preamp over drive (saturated drive at low level)
and the DRD at lower distortion but raised level so it has more punch and dynamics like a high headroom power amp....
and then use the BPB at the end to simply raise the level of either or both drive pedals......giving us the BBOD by itself , the DRD by itself and the combination of the two and then a straight level boost of any of these or the straight clean signal from the BPB' (I have a RRB... Red Rooster Booster in last position for now... updated photo soon).
