Removed the hum from Cognito-Perceptu's Pill-bottle-4 sample. Original sample had truck in background in addition to some low frequency hum. Used the Remove Hum feature on Izotope RX2 and, presto-chango, no distracting background noise.

Now there is still a high frequency hum which I did not touch. I think this could be mitigated with a Low pass Filter in EQ if you choose.

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