type: dsp
Linearly remap the MIDI input velocity from [Input MIN Velocity, Input MAX Velocity] to [Output MIN Velocity, Output MAX Velocity] clamped to [1, 127].
Copy or symlink the midi_remap_velocity.lua file to $ARDOUR_DATA_PATH/scripts. Check Scripting > Lua Scripting > Managing Scripts in the Ardour Manual for more details.