Inhale perfluorobutane if you want a voice even deeper than sulphur hexafluoride offers

My understanding is that the gas doesn’t actually make your voice deeper, it just changes the timbre, muting the upper harmonics, and emphasizing the lower frequencies. But those were already there. So it doesn’t make your voice deeper (or more “manly”, whatever that means), it just shows you how deep your voice actually goes. Very cool, in any case.

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