We still need to compare the generation of envelope peak velocities between the LPC controlling Reaktor (handling this internally) and the Linux Engine 1.5+ (overtaking this duty).
The "Linux Engine 1.56 Status" spreadsheet (Nonlinear Labs > Linux Engine) offers a sheet called "Level Velocity Tests", in which the generated peak levels (depending on the key down velocity and a level velocity parameter) are documented for the Linux Engine. The corresponding values generated by the LPC are still missing.