Tone Generator for Setting Gains

I was looking for a good test tone generator on the web and found https://shareit1.element5.com/product.html?productid=151791

It's a good generator for recording your own test tone CD.  This should be purchased, though, as the trial version won't allow recordings more than 3 sec in length.  I bought the licensed version and have found it to be very versatile and easy to work with.

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.