Cynical of advanced experimentation into using sound waves (8)
I believe the answer is:
sardonic
'cynical' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for sardonic that I've seen before include "Scornfully mocking" , "Scornfully derisive" , "Disdainfully or ironically humorous" , "Cynical -- so rancid (anag)" , "Heartless and bitter" .)