Here are your controls and their definitions:
Enable Hammer-Ons - This switch will toggle Hammer-Ons to be active or inactive. When it is positioned to OFF, Hammer-On Mode will be disabled. Hammer-Ons are set to active by default.
Hammer-On Timer x 10 milliseconds - The amount of time Hammer-Ons / Pull-Offs are allowed to occur after a note is played. This function will reset after each note is triggered.
Hammer-On Velocity On/Off - This setting normalizes the volume of HOs and POs and tries to determine the threshold based on the speed of your fingers. We recommend leaving this ON.