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Full user review
This review was originally posted on VersionTracker.com.
This is one of those "hidden gems" that is less popular than other programs but is as good as or better than them in many, many ways, and is MUCH less expensive. Comparing this to many of the shareware programs isn't fair because most of them are just toys or stripped-down programs that are OK for occasional and strictly-amateur use. DSP-Quattro plays with the big boys. And, amazingly, DSP-Quattro is just about the only program that correctly draws a waveform! Seriously--try zooming in and out on any waveform (for maximum fun, use a sine wave) using, say, Peak, and watch how the frequency apparently changes depending on zoom level! This is just one of many, many things that DSP-Quattro gets right. Highly recommended.