Nails On Chalkboard 1 Hour
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Took a bit i had to find a material similar to a chalkboard (as chalkboards are hard to come by these days) and run fingernails across it. After that i loaded the recording into Audacity and cleaned up the audio (remove background noise) and looped iot for the hour.
Here you go you guys requested it Nails on chalkboard for 1 Hour