sound1.wav: Made with oscillating pressure and tension (out of phase).

sound2.wav: Made with oscillating pressure and tension (different for left and right side of the syrinx).

sound3.wav: ADSR envelope on the pressure, and a down glissando on the tension.

sound4.wav: ADSR envelope on the pressure, and an up glissando on the tension.

sound5.wav: An oscillating pressure and tension but with a higher pitch