It sounds almost like a supercharger whine. Not high pitch at all like a fan belt can be.
Not that I can hear, if so it is very faint. When the noise is occurring, it's only under acceleration, or as the RPMs raise, and then drop off in neutral or when you let off the gas.
Because this is so sporadic, and possibly in the early stages or wear, based on everything I told you, should I worry about driving it 300+ miles this weekend?