I don't know if this is the answer you are looking for but it would be flat unless the player pushed the tuning slide in.
Answer:
The CO2 Extinguisher Cannisters contain carbon dioxide in liquid form, and when the extinguisher is let off the liquid is released into the air neutralising the oxygen that the fire is feeding on, disabling the fires ability to spread.
It is softer than topaz and and it is softer than diamond (diamond has a Mohs hardness of 10, which is the highest value of the scale)
Lipid you can look up the chemical structures and lipids are the longest which make them the largest
