Playing chromatically down to pedal F on the bassoon. No plastic extensions or extra keys. Just "multiphonic" fingerings with very strong differential tone fundamentals. Cell phone microphone doesn't make it sound half as terrible as it really is!

Low A: play low F but leave off the third finger of left hand.
Low G#: Play low E but leave off third finger left hand
Low G: Play low Eb but leave off first finger right hand
Low F#: Play low D but leave off first finger right hand
Low F: Play low Db. Slide the second finger of the right hand so that is only pressing the ring key alone, but not actually covering the tone hole.

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