Quoted from Axl:
Everytime the up/down post on the ramp goes down it makes a horrible buzzing sound. anyone have a clue how to fix it?
This is because the plunger on the ramp flap pin isn't reaching the metal coil stop. This together with the fact that the coil is driven using PWM makes it buzz. I fixed this by changing the dual coil bracket above the coil to a single one. This made the plunger reaching the coil stop and it is now quiet when activated.