Yes, I think Sri Aurobindo is describing all the sounds which are heard as the Chakras as opened. These are also mentioned in the Hatha Yoga Pradipika Vol 4 http://www.santosha.com/philosophy/hathayoga-pradipika-chapter4.html 84. In the first stage, the sounds are surging, thundering like the beating of kettle drums and jingling ones. In the intermediate stage, they are like those produced by conch, Mridanga, bells, &c. 85. In the last stage, the sounds resemble those from tinklets, flute, Vina, bee, &c. These various kinds of sounds are heard as being produced in the body.