Can you please help me with my problem? I need to measure how sound spreads trough foam. To measure it i need one source of sound and one recorder of sound. Ofcourse i need to change frequency and strength of sound to see if there is change in its spreading trough foam. I don't know how to produce and measure sound of specific frequency and strength? I have some ideas of my own but I am not sure if they would work. First i have to produce sound. Is there an instrument that produces different kinds of sound and shows their frequency and strength? Perhaps a computer program? I could use some kind of musical instrument to produce sound but then I would have to measure its frequency and strength and it would not be so precise. How to measure frequency and strength of sound: First idea: Could I use microphones connected to computer? What software would I have to get then? Would it be precise? :uhh: Second idea: Could I get some kind of instrument which meashures it? Please help.