RE: Servo Buzz
while i seen a whole lot of comments about 'is it digital or analog' that's not the only pertinent question, is it coreless? coreless servos tend to buzz because they don't have the weight in the motor windings to provide a positive position hold and allow for 'over shooting' of neutral so they hunt for center constantly and buzz doing so. touching the servo will stop the buzz because it prevents the over shooting and constant oscillation
kc