I have used a PC program to produce test tones of various frequencies. I was wondering if there was a better way of doing it. Perhaps a test CD or something? I would like to compare and check various bass frequencies from 10 to 100 hz. Mostly for checking the frequency response of my speakers, my speakers and my subwoofer and also to compare different speakers. Any ideas? The thing I have though of is to record the tones from the PC software and burn a CD, but I was hoping there was already a more useful CD out there already.