Tokøta from Mastering.com breaks down Logic Pro's Velocity Processor, showing how its Compress/Expand mode reshapes MIDI dynamics without ever opening the piano roll.
The controls mirror an audio compressor exactly: threshold sets where processing kicks in, ratio controls its strength, and makeup gain (with an auto option) restores lost velocity afterward. The difference is the scale runs 1 to 127 instead of decibels.
Pulling the ratio back past zero flips compression into expansion, pushing quiet and loud notes further apart instead of together.
That expansion trick is useful for MIDI performances with an uneven playing hand, letting you accentuate a weak or strong side of the range in one move instead of manually adjusting note velocities one by one.