According to the walkthrough:
See 3 alcoves with dripping water. Each of the water drips at different speed. Now we need to produce the 3 sounds based on the speed and item placed to make music when the water drips on it.
Facing Sakhmet's statue, place water lily seeds on lower left alcove. This produces a water lily leaf that produces the wop wop fast and lower sound.
Place the sistrum at top left alcove and this produces a metallic sound.
Face Sakhmet's statue and see a dish by her feet. Use the purification vase on the dish to get a bowl of lava.
Place the bowl of lava at top right alcove to produce the hissing sound.
The door to the dolerite tools is now opened.
Based on what I read here, I'm thinking that it must be quite apparent when the door has been opened to the dolerite tools (but MaG can correct me here if I am wrong). Maybe replay this part to make sure you got the sounds correct?
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