Some revels prefer to keep their toes on the floor, so they choose to do planeo instead of voleo circular (which arcs through the horizontal and vertical planes.
The height of a voleo is a function of the amount of power the Mark puts into the co-contraction. (Of course the flexibility of the revel will determine the absolute height, but the mark can create various heights within a Revel’s range.)
To mark a voleo baso flex the base leg more during projection to extend the revel’s free leg on the floor and do not release this flexion, then make a pro voleo, with not too much power. (Some marks try to hold the revel down when leading voleo baso, but this is uncomfortable and unnecessary.)