When the expression map allows CC values from 1 to 127, the dynamic curve power is 2.5, the minimum and maximum dynamic levels are -6 and 6, and all humanization, polyphonic instrument voice balancing and note dynamics are disabled, here is the CC value for each dynamic level:
Dynamic │ CC Value ────────┼───────── pppppp │ 1 ppppp │ 2 pppp │ 5 ppp │ 12 pp │ 24 p │ 41 mp │ 52 mf │ 76 f │ 87 ff │ 104 fff │ 116 ffff │ 123 fffff │ 126 ffffff │ 127