Leviton Decora Light Dimmer Switch "base buzzing" Questions

2) Is it actually the dimmer? Some switches actually cause the bulbs to buzz. These may be resistor-based dimmers, you will need a dimmer with an auto transformer component. 3) Is the dimmer rated for

...THIS MOTOR REMOVE SCREW ON LEFT AND JUST BACK SCREW ON RIGHT A FEW TURNS, TIMER WILL ROCK UP OUT OF BASE THIS WAY . UN-HOOK WIRES ONE AT A TIME AND INSTALL WIRES FROM NEW MOTOR ONE AT A TIME.. THESE ...