Engel advertises this as a 4 speed pump.
(A) Which speed is “default”? High? Low?
(B) Each button push increases or decreases the default speed?
(C) Which indicator light corresponds to the choice of speed? ie. far left light for lowest speed to far right light for highest speed? or some other arrangement?
I don’t see enough difference in the actual output to differentiate which speed is which.
** I have sent an inquiry to Engel, but no response yet.**