Flying from Puyallup (PLU) to Arlington (AWO) cross country with full ATC

Flying a Cessna 172 from Puyallup to Arlington, WA on the east side of the valley. This was the first attempt at using my NFlightcam and has been compressed for time. Some key items like checklists may have been edited out but all calls from Air Traffic control (ATC) have been left in.
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[@charleseinarson]

What is making that sound? It appears to change with engine speed so could it be the alternator?

[@LetsFlyWa]

Pretty sure it is the alternator. I wasn't able to remove it from the audio so I'll look for a way of reducing it as an input to begin with.