You guys have nothing to worry about. What you guys are hearing is the back lash in the transmission gear set. What you are doing while in 1st gear with the clutch slightly or fully disengaged is loading up the transmission and as you depress the clutch and let the load off the transmission you are hearing the gears rattle. In a lot of transmissions 1st and 2nd gear sets are usually designed with different teeth then the rest of the gears due to the amount of stress that the 1st and 2nd gear sets see, so these gears usually create a lot more noise. Just like some cars that have a whining reverse gear due to how the teeth are cut (straight cut gears).
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