How i can turn the spin the motor before take off in auto of guided mode?

i want to spin the motor idle speed before take off for 10 sec and after that copter takes off . something like DJI that when you armed the copter motor just start spinnig and when you order to take off motors is going up ?

Are you looking for this ?

MOT_SPIN_ARM: Motor Spin armed

Note: This parameter is for advanced users

Point at which the motors start to spin expressed as a number from 0 to 1 in the entire output range. Should be lower than MOT_SPIN_MIN.

0.0:Low, 0.1:Default, 0.2:High

thank you so much i find it and it is working very good