VelocityCurveSM is a simple midi only plugin for re-scaling midi velocity values.
This plug requires a host application capable of routing midi data to and from audio
effect type VST plugins
Be aware that adjusting your velocity response in this way will reduce the resolution
of the data (which isn’t huge to begin with). If you have the option to adjust the
dynamic response of your midi controller, or the synth you are controlling, that
will probably be a better solution.