The MV (compression) starts with 5 x 24s and two should be your minimum. Less than this though and one would break perhaps. So a tapered stack is tried here: 4 x 24 becomes maybe 2 x 24, 22, 20, 18, 16, 14. The mid stack is said to aid the medium bumps (thus: mid!) whilst the BV does all. Playing with both at once though is said to be a skill! Some keep the thickset original CP set-up and only play with the BV initially so as to feel what it’s all doing!