Velocity 80 (mf)   M

Set the velocity of notes entered to 80. When entering notes via Step Input the velocity value is determined by the most recent select of a velocity. Quite useful.

Use step input recording in Logic Pro — Apple Support

To set the velocity of the inserted note: Click the Velocity buttons.
There are eight velocity values—represented by the traditional volume indicators ppp, pp, p, mp, mf, f, ff, and fff. These correspond to MIDI velocity values 16, 32, 48, 64, 80, 96, 112, and 127, respectively.